{"id":567226,"date":"2026-07-20T11:43:51","date_gmt":"2026-07-20T04:43:51","guid":{"rendered":"https:\/\/hoanghamobile.com\/tin-tuc\/?p=567226"},"modified":"2026-07-21T14:59:30","modified_gmt":"2026-07-21T07:59:30","slug":"cong-thuc-tinh-van-toc","status":"publish","type":"post","link":"https:\/\/hoanghamobile.com\/tin-tuc\/cong-thuc-tinh-van-toc\/","title":{"rendered":"C\u00f4ng th\u1ee9c t\u00ednh v\u1eadn t\u1ed1c: v = s\/t, c\u00e1ch \u0111\u1ed5i \u0111\u01a1n v\u1ecb v\u00e0 v\u00ed d\u1ee5"},"content":{"rendered":"<p>C\u00f4ng th\u1ee9c t\u00ednh v\u1eadn t\u1ed1c l\u00e0 v = s\/t, trong \u0111\u00f3 v l\u00e0 v\u1eadn t\u1ed1c, s l\u00e0 qu\u00e3ng \u0111\u01b0\u1eddng v\u1eadt \u0111i \u0111\u01b0\u1ee3c v\u00e0 t l\u00e0 th\u1eddi gian \u0111\u1ec3 \u0111i h\u1ebft qu\u00e3ng \u0111\u01b0\u1eddng \u0111\u00f3. \u0110\u00e2y l\u00e0 c\u00f4ng th\u1ee9c n\u1ec1n t\u1ea3ng c\u1ee7a c\u00e1c b\u00e0i to\u00e1n chuy\u1ec3n \u0111\u1ed9ng, xu\u1ea5t hi\u1ec7n xuy\u00ean su\u1ed1t t\u1eeb ch\u01b0\u01a1ng tr\u00ecnh To\u00e1n ti\u1ec3u h\u1ecdc \u0111\u1ebfn V\u1eadt l\u00fd THCS, THPT. N\u1eafm ch\u1eafc c\u00f4ng th\u1ee9c g\u1ed1c, b\u1ea1n c\u00f3 th\u1ec3 suy ra c\u00e1ch t\u00ednh qu\u00e3ng \u0111\u01b0\u1eddng, th\u1eddi gian, \u0111\u1ed3ng th\u1eddi \u0111\u1ed5i qua l\u1ea1i gi\u1eefa m\/s v\u00e0 km\/h m\u00e0 kh\u00f4ng nh\u1ea7m l\u1eabn. C\u00f9ng xem c\u00f4ng th\u1ee9c chi ti\u1ebft, b\u1ea3ng quy \u0111\u1ed5i \u0111\u01a1n v\u1ecb v\u00e0 c\u00e1c v\u00ed d\u1ee5 c\u00f3 l\u1eddi gi\u1ea3i t\u1eebng b\u01b0\u1edbc \u0111\u1ec3 \u00e1p d\u1ee5ng v\u00e0o b\u00e0i t\u1eadp.<\/p>\n<h2>C\u00f4ng th\u1ee9c t\u00ednh v\u1eadn t\u1ed1c l\u00e0 g\u00ec?<\/h2>\n<p>V\u1eadn t\u1ed1c \u0111\u01b0\u1ee3c t\u00ednh b\u1eb1ng c\u00f4ng th\u1ee9c: v = s \/ t.<\/p>\n<ul>\n<li>v: v\u1eadn t\u1ed1c (\u0111\u01a1n v\u1ecb m\/s ho\u1eb7c km\/h).<\/li>\n<li>s: qu\u00e3ng \u0111\u01b0\u1eddng v\u1eadt \u0111i \u0111\u01b0\u1ee3c (\u0111\u01a1n v\u1ecb m ho\u1eb7c km).<\/li>\n<li>t: th\u1eddi gian \u0111i h\u1ebft qu\u00e3ng \u0111\u01b0\u1eddng \u0111\u00f3 (\u0111\u01a1n v\u1ecb s ho\u1eb7c h).<\/li>\n<\/ul>\n<p>N\u00f3i c\u00e1ch kh\u00e1c, v\u1eadn t\u1ed1c b\u1eb1ng qu\u00e3ng \u0111\u01b0\u1eddng chia cho th\u1eddi gian. V\u1eadn t\u1ed1c c\u00e0ng l\u1edbn th\u00ec v\u1eadt chuy\u1ec3n \u0111\u1ed9ng c\u00e0ng nhanh; v\u1eadn t\u1ed1c b\u1eb1ng 0 ngh\u0129a l\u00e0 v\u1eadt \u0111ang \u0111\u1ee9ng y\u00ean. C\u00f4ng th\u1ee9c v = s\/t \u00e1p d\u1ee5ng \u0111\u00fang cho chuy\u1ec3n \u0111\u1ed9ng \u0111\u1ec1u, t\u1ee9c v\u1eadt \u0111i \u0111\u01b0\u1ee3c nh\u1eefng qu\u00e3ng \u0111\u01b0\u1eddng b\u1eb1ng nhau trong nh\u1eefng kho\u1ea3ng th\u1eddi gian b\u1eb1ng nhau; v\u1edbi chuy\u1ec3n \u0111\u1ed9ng kh\u00f4ng \u0111\u1ec1u, k\u1ebft qu\u1ea3 t\u00ednh ra th\u1ef1c ch\u1ea5t l\u00e0 v\u1eadn t\u1ed1c trung b\u00ecnh (xem ph\u1ea7n b\u00ean d\u01b0\u1edbi).<\/p>\n<p><img fetchpriority=\"high\" decoding=\"async\" class=\"size-full wp-image-567743 aligncenter\" src=\"https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/uploads\/2026\/07\/cong-thuc-tinh-van-toc-1.jpg\" alt=\"cong-thuc-tinh-van-toc-1\" width=\"800\" height=\"450\" srcset=\"https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/uploads\/2026\/07\/cong-thuc-tinh-van-toc-1.jpg 800w, https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/uploads\/2026\/07\/cong-thuc-tinh-van-toc-1-300x169.jpg 300w, https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/uploads\/2026\/07\/cong-thuc-tinh-van-toc-1-768x432.jpg 768w\" sizes=\"(max-width: 800px) 100vw, 800px\" \/><\/p>\n<h2>\u0110\u01a1n v\u1ecb c\u1ee7a v\u1eadn t\u1ed1c v\u00e0 c\u00e1ch \u0111\u1ed5i \u0111\u01a1n v\u1ecb<\/h2>\n<p>\u0110\u01a1n v\u1ecb chu\u1ea9n c\u1ee7a v\u1eadn t\u1ed1c trong h\u1ec7 \u0111o l\u01b0\u1eddng qu\u1ed1c t\u1ebf (SI) l\u00e0 m\u00e9t tr\u00ean gi\u00e2y (m\/s). Trong \u0111\u1eddi s\u1ed1ng, \u0111\u01a1n v\u1ecb \u0111\u01b0\u1ee3c d\u00f9ng ph\u1ed5 bi\u1ebfn h\u01a1n l\u00e0 ki-l\u00f4-m\u00e9t tr\u00ean gi\u1edd (km\/h), nh\u1ea5t l\u00e0 khi n\u00f3i v\u1ec1 t\u1ed1c \u0111\u1ed9 xe c\u1ed9. C\u00e1ch \u0111\u1ed5i gi\u1eefa hai \u0111\u01a1n v\u1ecb n\u00e0y nh\u01b0 sau:<\/p>\n<ul>\n<li>\u0110\u1ed5i t\u1eeb m\/s sang km\/h: nh\u00e2n v\u1edbi 3,6 (v\u00ec 1 m\/s = 3,6 km\/h).<\/li>\n<li>\u0110\u1ed5i t\u1eeb km\/h sang m\/s: chia cho 3,6 (v\u00ec 1 km\/h \u2248 0,278 m\/s).<\/li>\n<\/ul>\n<p>V\u00ed d\u1ee5: 10 m\/s = 10 \u00d7 3,6 = 36 km\/h; ng\u01b0\u1ee3c l\u1ea1i 72 km\/h = 72 \/ 3,6 = 20 m\/s. \u0110\u1ec3 tra nhanh, b\u1ea1n c\u00f3 th\u1ec3 tham kh\u1ea3o b\u1ea3ng quy \u0111\u1ed5i m\u1ed9t s\u1ed1 gi\u00e1 tr\u1ecb th\u01b0\u1eddng g\u1eb7p d\u01b0\u1edbi \u0111\u00e2y:<\/p>\n<table>\n<thead>\n<tr>\n<th>m\/s<\/th>\n<th>km\/h<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td>1 m\/s<\/td>\n<td>3,6 km\/h<\/td>\n<\/tr>\n<tr>\n<td>5 m\/s<\/td>\n<td>18 km\/h<\/td>\n<\/tr>\n<tr>\n<td>10 m\/s<\/td>\n<td>36 km\/h<\/td>\n<\/tr>\n<tr>\n<td>15 m\/s<\/td>\n<td>54 km\/h<\/td>\n<\/tr>\n<tr>\n<td>20 m\/s<\/td>\n<td>72 km\/h<\/td>\n<\/tr>\n<tr>\n<td>25 m\/s<\/td>\n<td>90 km\/h<\/td>\n<\/tr>\n<tr>\n<td>30 m\/s<\/td>\n<td>108 km\/h<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p>L\u01b0u \u00fd: tr\u01b0\u1edbc khi thay s\u1ed1 v\u00e0o c\u00f4ng th\u1ee9c, h\u00e3y \u0111\u01b0a qu\u00e3ng \u0111\u01b0\u1eddng v\u00e0 th\u1eddi gian v\u1ec1 c\u00f9ng m\u1ed9t h\u1ec7 \u0111\u01a1n v\u1ecb (v\u00ed d\u1ee5 \u0111\u1ed5i ph\u00fat sang gi\u1edd) \u0111\u1ec3 tr\u00e1nh sai k\u1ebft qu\u1ea3.<\/p>\n<p><strong>Xem th\u00eam: <a href=\"https:\/\/hoanghamobile.com\/tin-tuc\/nhiet-luong-la-gi\/\">Nhi\u1ec7t l\u01b0\u1ee3ng l\u00e0 g\u00ec? \u2013 C\u00f4ng th\u1ee9c t\u00ednh nhi\u1ec7t l\u01b0\u1ee3ng<\/a><\/strong><\/p>\n<p><img decoding=\"async\" class=\"size-full wp-image-567744 aligncenter\" src=\"https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/uploads\/2026\/07\/cong-thuc-tinh-van-toc-2.jpg\" alt=\"cong-thuc-tinh-van-toc-2\" width=\"800\" height=\"450\" srcset=\"https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/uploads\/2026\/07\/cong-thuc-tinh-van-toc-2.jpg 800w, https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/uploads\/2026\/07\/cong-thuc-tinh-van-toc-2-300x169.jpg 300w, https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/uploads\/2026\/07\/cong-thuc-tinh-van-toc-2-768x432.jpg 768w\" sizes=\"(max-width: 800px) 100vw, 800px\" \/><\/p>\n<h2>C\u00e1c c\u00f4ng th\u1ee9c suy ra t\u1eeb c\u00f4ng th\u1ee9c v\u1eadn t\u1ed1c<\/h2>\n<p>T\u1eeb c\u00f4ng th\u1ee9c g\u1ed1c v = s\/t, b\u1ea1n c\u00f3 th\u1ec3 bi\u1ebfn \u0111\u1ed5i \u0111\u1ec3 t\u00ednh qu\u00e3ng \u0111\u01b0\u1eddng ho\u1eb7c th\u1eddi gian khi \u0111\u00e3 bi\u1ebft hai \u0111\u1ea1i l\u01b0\u1ee3ng c\u00f2n l\u1ea1i:<\/p>\n<table>\n<thead>\n<tr>\n<th>C\u1ea7n t\u00ednh<\/th>\n<th>C\u00f4ng th\u1ee9c<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td>V\u1eadn t\u1ed1c<\/td>\n<td>v = s \/ t<\/td>\n<\/tr>\n<tr>\n<td>Qu\u00e3ng \u0111\u01b0\u1eddng<\/td>\n<td>s = v \u00d7 t<\/td>\n<\/tr>\n<tr>\n<td>Th\u1eddi gian<\/td>\n<td>t = s \/ v<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p>Ba c\u00f4ng th\u1ee9c tr\u00ean th\u1ef1c ch\u1ea5t ch\u1ec9 l\u00e0 m\u1ed9t, bi\u1ebfn \u0111\u1ed5i qua l\u1ea1i theo quy t\u1eafc to\u00e1n h\u1ecdc th\u00f4ng th\u01b0\u1eddng: mu\u1ed1n t\u00ecm qu\u00e3ng \u0111\u01b0\u1eddng th\u00ec l\u1ea5y v\u1eadn t\u1ed1c nh\u00e2n th\u1eddi gian, mu\u1ed1n t\u00ecm th\u1eddi gian th\u00ec l\u1ea5y qu\u00e3ng \u0111\u01b0\u1eddng chia v\u1eadn t\u1ed1c. B\u1ea1n ch\u1ec9 c\u1ea7n nh\u1edb c\u00f4ng th\u1ee9c g\u1ed1c v = s\/t l\u00e0 c\u00f3 th\u1ec3 t\u1ef1 suy ra hai c\u00f4ng th\u1ee9c c\u00f2n l\u1ea1i khi c\u1ea7n.<\/p>\n<h2>V\u1eadn t\u1ed1c trung b\u00ecnh v\u00e0 v\u1eadn t\u1ed1c t\u1ee9c th\u1eddi<\/h2>\n<p>Trong chuy\u1ec3n \u0111\u1ed9ng th\u1ef1c t\u1ebf, v\u1eadt hi\u1ebfm khi gi\u1eef nguy\u00ean m\u1ed9t v\u1eadn t\u1ed1c su\u1ed1t h\u00e0nh tr\u00ecnh, v\u00ec v\u1eady c\u1ea7n ph\u00e2n bi\u1ec7t hai kh\u00e1i ni\u1ec7m sau:<\/p>\n<ul>\n<li><strong>V\u1eadn t\u1ed1c trung b\u00ecnh:<\/strong> b\u1eb1ng t\u1ed5ng qu\u00e3ng \u0111\u01b0\u1eddng \u0111i \u0111\u01b0\u1ee3c chia cho t\u1ed5ng th\u1eddi gian \u0111i h\u1ebft qu\u00e3ng \u0111\u01b0\u1eddng \u0111\u00f3. \u0110\u00e2y l\u00e0 con s\u1ed1 \u0111\u1ea1i di\u1ec7n cho c\u1ea3 h\u00e0nh tr\u00ecnh, kh\u00f4ng ph\u1ea3i trung b\u00ecnh c\u1ed9ng c\u1ee7a c\u00e1c v\u1eadn t\u1ed1c th\u00e0nh ph\u1ea7n.<\/li>\n<li><strong>V\u1eadn t\u1ed1c t\u1ee9c th\u1eddi:<\/strong> l\u00e0 v\u1eadn t\u1ed1c c\u1ee7a v\u1eadt t\u1ea1i m\u1ed9t th\u1eddi \u0111i\u1ec3m ho\u1eb7c m\u1ed9t v\u1ecb tr\u00ed c\u1ee5 th\u1ec3 tr\u00ean \u0111\u01b0\u1eddng \u0111i, gi\u1ed1ng nh\u01b0 con s\u1ed1 hi\u1ec3n th\u1ecb tr\u00ean \u0111\u1ed3ng h\u1ed3 t\u1ed1c \u0111\u1ed9 (speedometer) c\u1ee7a xe m\u00e1y, \u00f4 t\u00f4 t\u1ea1i t\u1eebng th\u1eddi \u0111i\u1ec3m.<\/li>\n<\/ul>\n<p>V\u00ed d\u1ee5: m\u1ed9t ng\u01b0\u1eddi \u0111i 100 km trong 2 gi\u1edd \u0111\u1ea7u, sau \u0111\u00f3 \u0111i ti\u1ebfp 60 km trong 1 gi\u1edd ti\u1ebfp theo. V\u1eadn t\u1ed1c trung b\u00ecnh c\u1ea3 h\u00e0nh tr\u00ecnh l\u00e0 (100 + 60) \/ (2 + 1) = 160 \/ 3 \u2248 53,3 km\/h. Con s\u1ed1 n\u00e0y kh\u00e1c v\u1edbi trung b\u00ecnh c\u1ed9ng c\u1ee7a hai v\u1eadn t\u1ed1c t\u1eebng ch\u1eb7ng (50 km\/h v\u00e0 60 km\/h, trung b\u00ecnh c\u1ed9ng l\u00e0 55 km\/h) v\u00ec th\u1eddi gian hai ch\u1eb7ng kh\u00f4ng b\u1eb1ng nhau, n\u00ean kh\u00f4ng th\u1ec3 l\u1ea5y trung b\u00ecnh c\u1ed9ng \u0111\u01a1n gi\u1ea3n.<\/p>\n<p><img decoding=\"async\" class=\"size-full wp-image-567745 aligncenter\" src=\"https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/uploads\/2026\/07\/cong-thuc-tinh-van-toc-3.jpg\" alt=\"cong-thuc-tinh-van-toc-3\" width=\"800\" height=\"450\" srcset=\"https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/uploads\/2026\/07\/cong-thuc-tinh-van-toc-3.jpg 800w, https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/uploads\/2026\/07\/cong-thuc-tinh-van-toc-3-300x169.jpg 300w, https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/uploads\/2026\/07\/cong-thuc-tinh-van-toc-3-768x432.jpg 768w\" sizes=\"(max-width: 800px) 100vw, 800px\" \/><\/p>\n<h2>V\u00ed d\u1ee5 t\u00ednh v\u1eadn t\u1ed1c c\u00f3 l\u1eddi gi\u1ea3i chi ti\u1ebft<\/h2>\n<p>D\u01b0\u1edbi \u0111\u00e2y l\u00e0 m\u1ed9t s\u1ed1 d\u1ea1ng b\u00e0i t\u1eadp th\u01b0\u1eddng g\u1eb7p v\u1ec1 v\u1eadn t\u1ed1c, qu\u00e3ng \u0111\u01b0\u1eddng v\u00e0 th\u1eddi gian, k\u00e8m l\u1eddi gi\u1ea3i t\u1eebng b\u01b0\u1edbc \u0111\u1ec3 b\u1ea1n \u0111\u1ed1i chi\u1ebfu c\u00e1ch l\u00e0m.<\/p>\n<p><strong>V\u00ed d\u1ee5 1 \u2014 T\u00ednh v\u1eadn t\u1ed1c:<\/strong> M\u1ed9t \u00f4 t\u00f4 \u0111i \u0111\u01b0\u1ee3c qu\u00e3ng \u0111\u01b0\u1eddng 150 km trong 3 gi\u1edd. T\u00ednh v\u1eadn t\u1ed1c c\u1ee7a \u00f4 t\u00f4.<br \/>\nL\u1eddi gi\u1ea3i: \u00c1p d\u1ee5ng c\u00f4ng th\u1ee9c v = s\/t, ta c\u00f3 v = 150 \/ 3 = 50 km\/h.<br \/>\n\u0110\u00e1p s\u1ed1: 50 km\/h.<\/p>\n<p><strong>V\u00ed d\u1ee5 2 \u2014 T\u00ednh v\u1eadn t\u1ed1c v\u00e0 \u0111\u1ed5i \u0111\u01a1n v\u1ecb:<\/strong> M\u1ed9t v\u1eadn \u0111\u1ed9ng vi\u00ean ch\u1ea1y 100 m trong 20 gi\u00e2y. T\u00ednh v\u1eadn t\u1ed1c c\u1ee7a v\u1eadn \u0111\u1ed9ng vi\u00ean theo m\/s v\u00e0 km\/h.<br \/>\nL\u1eddi gi\u1ea3i: \u00c1p d\u1ee5ng c\u00f4ng th\u1ee9c v = s\/t, ta c\u00f3 v = 100 \/ 20 = 5 m\/s. \u0110\u1ed5i sang km\/h: 5 \u00d7 3,6 = 18 km\/h.<br \/>\n\u0110\u00e1p s\u1ed1: 5 m\/s, t\u01b0\u01a1ng \u0111\u01b0\u01a1ng 18 km\/h.<\/p>\n<p><strong>V\u00ed d\u1ee5 3 \u2014 T\u00ednh qu\u00e3ng \u0111\u01b0\u1eddng:<\/strong> M\u1ed9t xe m\u00e1y ch\u1ea1y v\u1edbi v\u1eadn t\u1ed1c 40 km\/h trong 2 gi\u1edd 30 ph\u00fat. H\u1ecfi xe \u0111i \u0111\u01b0\u1ee3c qu\u00e3ng \u0111\u01b0\u1eddng bao nhi\u00eau km?<br \/>\nL\u1eddi gi\u1ea3i: \u0110\u1ed5i 2 gi\u1edd 30 ph\u00fat = 2,5 gi\u1edd. \u00c1p d\u1ee5ng c\u00f4ng th\u1ee9c s = v \u00d7 t, ta c\u00f3 s = 40 \u00d7 2,5 = 100 km.<br \/>\n\u0110\u00e1p s\u1ed1: 100 km.<\/p>\n<p><strong>V\u00ed d\u1ee5 4 \u2014 T\u00ednh th\u1eddi gian:<\/strong> M\u1ed9t ng\u01b0\u1eddi \u0111i b\u1ed9 qu\u00e3ng \u0111\u01b0\u1eddng 6 km v\u1edbi v\u1eadn t\u1ed1c trung b\u00ecnh 4 km\/h. H\u1ecfi ng\u01b0\u1eddi \u0111\u00f3 c\u1ea7n bao nhi\u00eau th\u1eddi gian \u0111\u1ec3 \u0111i h\u1ebft qu\u00e3ng \u0111\u01b0\u1eddng n\u00e0y?<br \/>\nL\u1eddi gi\u1ea3i: \u00c1p d\u1ee5ng c\u00f4ng th\u1ee9c t = s\/v, ta c\u00f3 t = 6 \/ 4 = 1,5 gi\u1edd, t\u1ee9c 1 gi\u1edd 30 ph\u00fat.<br \/>\n\u0110\u00e1p s\u1ed1: 1,5 gi\u1edd (1 gi\u1edd 30 ph\u00fat).<\/p>\n<p><strong>Xem th\u00eam: <a href=\"https:\/\/hoanghamobile.com\/tin-tuc\/cong-thuc-chinh-hop\/\">C\u00f4ng th\u1ee9c t\u00ednh ho\u00e1n v\u1ecb, ch\u1ec9nh h\u1ee3p v\u00e0 t\u1ed5 h\u1ee3p \u0111\u1ea7y \u0111\u1ee7<\/a><\/strong><\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"size-full wp-image-567746 aligncenter\" src=\"https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/uploads\/2026\/07\/cong-thuc-tinh-van-toc-4.jpg\" alt=\"cong-thuc-tinh-van-toc-4\" width=\"800\" height=\"450\" srcset=\"https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/uploads\/2026\/07\/cong-thuc-tinh-van-toc-4.jpg 800w, https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/uploads\/2026\/07\/cong-thuc-tinh-van-toc-4-300x169.jpg 300w, https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/uploads\/2026\/07\/cong-thuc-tinh-van-toc-4-768x432.jpg 768w\" sizes=\"(max-width: 800px) 100vw, 800px\" \/><\/p>\n<h2>M\u1ed9t s\u1ed1 l\u01b0u \u00fd khi t\u00ednh v\u1eadn t\u1ed1c<\/h2>\n<p>\u0110\u1ec3 tr\u00e1nh sai k\u1ebft qu\u1ea3 khi l\u00e0m b\u00e0i t\u1eadp v\u1ec1 v\u1eadn t\u1ed1c, b\u1ea1n n\u00ean l\u01b0u \u00fd m\u1ed9t s\u1ed1 \u0111i\u1ec3m sau:<\/p>\n<ul>\n<li><strong>\u0110\u1ed3ng nh\u1ea5t \u0111\u01a1n v\u1ecb tr\u01b0\u1edbc khi t\u00ednh:<\/strong> n\u1ebfu qu\u00e3ng \u0111\u01b0\u1eddng v\u00e0 th\u1eddi gian cho \u1edf hai \u0111\u01a1n v\u1ecb kh\u00e1c h\u1ec7 (v\u00ed d\u1ee5 km v\u00e0 ph\u00fat), h\u00e3y \u0111\u1ed5i v\u1ec1 c\u00f9ng m\u1ed9t h\u1ec7 tr\u01b0\u1edbc khi thay c\u00f4ng th\u1ee9c.<\/li>\n<li><strong>Kh\u00f4ng nh\u1ea7m v\u1eadn t\u1ed1c trung b\u00ecnh v\u1edbi trung b\u00ecnh c\u1ed9ng v\u1eadn t\u1ed1c:<\/strong> nh\u01b0 v\u00ed d\u1ee5 \u1edf ph\u1ea7n tr\u00ean, hai c\u00e1ch t\u00ednh ch\u1ec9 tr\u00f9ng nhau khi th\u1eddi gian c\u1ee7a c\u00e1c ch\u1eb7ng b\u1eb1ng nhau.<\/li>\n<li><strong>Qu\u00e3ng \u0111\u01b0\u1eddng lu\u00f4n kh\u00f4ng \u00e2m:<\/strong> trong c\u00f4ng th\u1ee9c v = s\/t \u1edf ch\u01b0\u01a1ng tr\u00ecnh ph\u1ed5 th\u00f4ng, s l\u00e0 t\u1ed5ng chi\u1ec1u d\u00e0i qu\u00e3ng \u0111\u01b0\u1eddng \u0111\u00e3 \u0111i.<\/li>\n<li><strong>L\u00e0m tr\u00f2n h\u1ee3p l\u00fd:<\/strong> khi k\u1ebft qu\u1ea3 l\u00e0 s\u1ed1 th\u1eadp ph\u00e2n tu\u1ea7n ho\u00e0n (v\u00ed d\u1ee5 160\/3), n\u00ean l\u00e0m tr\u00f2n \u0111\u1ebfn 1-2 ch\u1eef s\u1ed1 th\u1eadp ph\u00e2n v\u00e0 ghi r\u00f5 d\u1ea5u \u2248 thay v\u00ec d\u1ea5u b\u1eb1ng.<\/li>\n<\/ul>\n<h2>C\u00e2u h\u1ecfi th\u01b0\u1eddng g\u1eb7p v\u1ec1 c\u00f4ng th\u1ee9c t\u00ednh v\u1eadn t\u1ed1c<\/h2>\n<h3>C\u00f4ng th\u1ee9c t\u00ednh v\u1eadn t\u1ed1c l\u00e0 g\u00ec?<\/h3>\n<p>C\u00f4ng th\u1ee9c t\u00ednh v\u1eadn t\u1ed1c l\u00e0 v = s\/t, trong \u0111\u00f3 s l\u00e0 qu\u00e3ng \u0111\u01b0\u1eddng v\u1eadt \u0111i \u0111\u01b0\u1ee3c v\u00e0 t l\u00e0 th\u1eddi gian \u0111i h\u1ebft qu\u00e3ng \u0111\u01b0\u1eddng \u0111\u00f3.<\/p>\n<h3>\u0110\u01a1n v\u1ecb c\u1ee7a v\u1eadn t\u1ed1c l\u00e0 g\u00ec?<\/h3>\n<p>\u0110\u01a1n v\u1ecb chu\u1ea9n theo h\u1ec7 SI l\u00e0 m\u00e9t\/gi\u00e2y (m\/s); ngo\u00e0i ra c\u00f2n d\u00f9ng ph\u1ed5 bi\u1ebfn ki-l\u00f4-m\u00e9t\/gi\u1edd (km\/h), v\u1edbi 1 m\/s = 3,6 km\/h.<\/p>\n<h3>C\u00e1ch \u0111\u1ed5i km\/h sang m\/s nh\u01b0 th\u1ebf n\u00e0o?<\/h3>\n<p>L\u1ea5y s\u1ed1 km\/h chia cho 3,6 s\u1ebd ra k\u1ebft qu\u1ea3 theo m\/s.<\/p>\n<h3>C\u00f4ng th\u1ee9c t\u00ednh qu\u00e3ng \u0111\u01b0\u1eddng v\u00e0 th\u1eddi gian t\u1eeb v\u1eadn t\u1ed1c l\u00e0 g\u00ec?<\/h3>\n<p>Qu\u00e3ng \u0111\u01b0\u1eddng t\u00ednh b\u1eb1ng s = v \u00d7 t; th\u1eddi gian t\u00ednh b\u1eb1ng t = s \/ v.<\/p>\n<h3>V\u1eadn t\u1ed1c trung b\u00ecnh t\u00ednh nh\u01b0 th\u1ebf n\u00e0o?<\/h3>\n<p>V\u1eadn t\u1ed1c trung b\u00ecnh b\u1eb1ng t\u1ed5ng qu\u00e3ng \u0111\u01b0\u1eddng \u0111i \u0111\u01b0\u1ee3c chia cho t\u1ed5ng th\u1eddi gian \u0111i h\u1ebft qu\u00e3ng \u0111\u01b0\u1eddng \u0111\u00f3, kh\u00f4ng ph\u1ea3i l\u00e0 trung b\u00ecnh c\u1ed9ng c\u1ee7a c\u00e1c v\u1eadn t\u1ed1c th\u00e0nh ph\u1ea7n.<\/p>\n<h3>V\u1eadn t\u1ed1c trung b\u00ecnh v\u00e0 v\u1eadn t\u1ed1c t\u1ee9c th\u1eddi kh\u00e1c nhau ra sao?<\/h3>\n<p>V\u1eadn t\u1ed1c trung b\u00ecnh \u0111\u1ea1i di\u1ec7n cho c\u1ea3 m\u1ed9t h\u00e0nh tr\u00ecnh ho\u1eb7c m\u1ed9t kho\u1ea3ng th\u1eddi gian, c\u00f2n v\u1eadn t\u1ed1c t\u1ee9c th\u1eddi l\u00e0 v\u1eadn t\u1ed1c t\u1ea1i m\u1ed9t th\u1eddi \u0111i\u1ec3m ho\u1eb7c v\u1ecb tr\u00ed c\u1ee5 th\u1ec3, gi\u1ed1ng nh\u01b0 s\u1ed1 hi\u1ec3n th\u1ecb tr\u00ean \u0111\u1ed3ng h\u1ed3 t\u1ed1c \u0111\u1ed9 c\u1ee7a xe.<\/p>\n<h3>V\u1eadn t\u1ed1c v\u00e0 t\u1ed1c \u0111\u1ed9 c\u00f3 ph\u1ea3i l\u00e0 m\u1ed9t kh\u00f4ng?<\/h3>\n<p>V\u1ec1 b\u1ea3n ch\u1ea5t, t\u1ed1c \u0111\u1ed9 l\u00e0 \u0111\u1ea1i l\u01b0\u1ee3ng ch\u1ec9 c\u00f3 \u0111\u1ed9 l\u1edbn c\u00f2n v\u1eadn t\u1ed1c l\u00e0 \u0111\u1ea1i l\u01b0\u1ee3ng c\u00f3 h\u01b0\u1edbng. Tuy nhi\u00ean \u1edf ch\u01b0\u01a1ng tr\u00ecnh ti\u1ec3u h\u1ecdc v\u00e0 THCS, c\u00f4ng th\u1ee9c v = s\/t \u0111\u01b0\u1ee3c d\u00f9ng chung cho c\u1ea3 hai kh\u00e1i ni\u1ec7m v\u00e0 cho c\u00f9ng m\u1ed9t k\u1ebft qu\u1ea3 trong chuy\u1ec3n \u0111\u1ed9ng th\u1eb3ng theo m\u1ed9t chi\u1ec1u.<\/p>\n<h3>V\u00ec sao ph\u1ea3i \u0111\u1ed5i \u0111\u01a1n v\u1ecb tr\u01b0\u1edbc khi t\u00ednh v\u1eadn t\u1ed1c?<\/h3>\n<p>V\u00ec qu\u00e3ng \u0111\u01b0\u1eddng v\u00e0 th\u1eddi gian trong \u0111\u1ec1 b\u00e0i c\u00f3 th\u1ec3 cho \u1edf c\u00e1c \u0111\u01a1n v\u1ecb kh\u00e1c h\u1ec7 nhau, ch\u1eb3ng h\u1ea1n km v\u00e0 ph\u00fat; n\u1ebfu kh\u00f4ng \u0111\u1ed5i v\u1ec1 c\u00f9ng m\u1ed9t h\u1ec7 tr\u01b0\u1edbc khi chia, k\u1ebft qu\u1ea3 t\u00ednh \u0111\u01b0\u1ee3c s\u1ebd sai.<br \/>\n<script type=\"application\/ld+json\">\n{\n  \"@context\": \"https:\/\/schema.org\",\n  \"@type\": \"FAQPage\",\n  \"mainEntity\": [\n    {\n      \"@type\": \"Question\",\n      \"name\": \"C\u00f4ng th\u1ee9c t\u00ednh v\u1eadn t\u1ed1c l\u00e0 g\u00ec?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"C\u00f4ng th\u1ee9c t\u00ednh v\u1eadn t\u1ed1c l\u00e0 v = s\/t, trong \u0111\u00f3 s l\u00e0 qu\u00e3ng \u0111\u01b0\u1eddng v\u1eadt \u0111i \u0111\u01b0\u1ee3c v\u00e0 t l\u00e0 th\u1eddi gian \u0111i h\u1ebft qu\u00e3ng \u0111\u01b0\u1eddng \u0111\u00f3.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"\u0110\u01a1n v\u1ecb c\u1ee7a v\u1eadn t\u1ed1c l\u00e0 g\u00ec?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"\u0110\u01a1n v\u1ecb chu\u1ea9n theo h\u1ec7 SI l\u00e0 m\u00e9t\/gi\u00e2y (m\/s); ngo\u00e0i ra c\u00f2n d\u00f9ng ph\u1ed5 bi\u1ebfn ki-l\u00f4-m\u00e9t\/gi\u1edd (km\/h), v\u1edbi 1 m\/s = 3,6 km\/h.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"C\u00e1ch \u0111\u1ed5i km\/h sang m\/s nh\u01b0 th\u1ebf n\u00e0o?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"L\u1ea5y s\u1ed1 km\/h chia cho 3,6 s\u1ebd ra k\u1ebft qu\u1ea3 theo m\/s.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"C\u00f4ng th\u1ee9c t\u00ednh qu\u00e3ng \u0111\u01b0\u1eddng v\u00e0 th\u1eddi gian t\u1eeb v\u1eadn t\u1ed1c l\u00e0 g\u00ec?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Qu\u00e3ng \u0111\u01b0\u1eddng t\u00ednh b\u1eb1ng s = v \u00d7 t; th\u1eddi gian t\u00ednh b\u1eb1ng t = s \/ v.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"V\u1eadn t\u1ed1c trung b\u00ecnh t\u00ednh nh\u01b0 th\u1ebf n\u00e0o?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"V\u1eadn t\u1ed1c trung b\u00ecnh b\u1eb1ng t\u1ed5ng qu\u00e3ng \u0111\u01b0\u1eddng \u0111i \u0111\u01b0\u1ee3c chia cho t\u1ed5ng th\u1eddi gian \u0111i h\u1ebft qu\u00e3ng \u0111\u01b0\u1eddng \u0111\u00f3, kh\u00f4ng ph\u1ea3i l\u00e0 trung b\u00ecnh c\u1ed9ng c\u1ee7a c\u00e1c v\u1eadn t\u1ed1c th\u00e0nh ph\u1ea7n.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"V\u1eadn t\u1ed1c trung b\u00ecnh v\u00e0 v\u1eadn t\u1ed1c t\u1ee9c th\u1eddi kh\u00e1c nhau ra sao?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"V\u1eadn t\u1ed1c trung b\u00ecnh \u0111\u1ea1i di\u1ec7n cho c\u1ea3 m\u1ed9t h\u00e0nh tr\u00ecnh ho\u1eb7c m\u1ed9t kho\u1ea3ng th\u1eddi gian, c\u00f2n v\u1eadn t\u1ed1c t\u1ee9c th\u1eddi l\u00e0 v\u1eadn t\u1ed1c t\u1ea1i m\u1ed9t th\u1eddi \u0111i\u1ec3m ho\u1eb7c v\u1ecb tr\u00ed c\u1ee5 th\u1ec3, gi\u1ed1ng nh\u01b0 s\u1ed1 hi\u1ec3n th\u1ecb tr\u00ean \u0111\u1ed3ng h\u1ed3 t\u1ed1c \u0111\u1ed9 c\u1ee7a xe.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"V\u1eadn t\u1ed1c v\u00e0 t\u1ed1c \u0111\u1ed9 c\u00f3 ph\u1ea3i l\u00e0 m\u1ed9t kh\u00f4ng?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"V\u1ec1 b\u1ea3n ch\u1ea5t, t\u1ed1c \u0111\u1ed9 l\u00e0 \u0111\u1ea1i l\u01b0\u1ee3ng ch\u1ec9 c\u00f3 \u0111\u1ed9 l\u1edbn c\u00f2n v\u1eadn t\u1ed1c l\u00e0 \u0111\u1ea1i l\u01b0\u1ee3ng c\u00f3 h\u01b0\u1edbng. Tuy nhi\u00ean \u1edf ch\u01b0\u01a1ng tr\u00ecnh ti\u1ec3u h\u1ecdc v\u00e0 THCS, c\u00f4ng th\u1ee9c v = s\/t \u0111\u01b0\u1ee3c d\u00f9ng chung cho c\u1ea3 hai kh\u00e1i ni\u1ec7m v\u00e0 cho c\u00f9ng m\u1ed9t k\u1ebft qu\u1ea3 trong chuy\u1ec3n \u0111\u1ed9ng th\u1eb3ng theo m\u1ed9t chi\u1ec1u.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"V\u00ec sao ph\u1ea3i \u0111\u1ed5i \u0111\u01a1n v\u1ecb tr\u01b0\u1edbc khi t\u00ednh v\u1eadn t\u1ed1c?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"V\u00ec qu\u00e3ng \u0111\u01b0\u1eddng v\u00e0 th\u1eddi gian trong \u0111\u1ec1 b\u00e0i c\u00f3 th\u1ec3 cho \u1edf c\u00e1c \u0111\u01a1n v\u1ecb kh\u00e1c h\u1ec7 nhau, ch\u1eb3ng h\u1ea1n km v\u00e0 ph\u00fat; n\u1ebfu kh\u00f4ng \u0111\u1ed5i v\u1ec1 c\u00f9ng m\u1ed9t h\u1ec7 tr\u01b0\u1edbc khi chia, k\u1ebft qu\u1ea3 t\u00ednh \u0111\u01b0\u1ee3c s\u1ebd sai.\"\n      }\n    }\n  ]\n}\n<\/script><\/p>\n<h2>K\u1ebft lu\u1eadn<\/h2>\n<p>T\u00f3m l\u1ea1i, c\u00f4ng th\u1ee9c t\u00ednh v\u1eadn t\u1ed1c l\u00e0 v = s\/t, t\u1eeb \u0111\u00f3 suy ra s = v \u00d7 t v\u00e0 t = s\/v. Ch\u1ec9 c\u1ea7n nh\u1edb c\u00f4ng th\u1ee9c g\u1ed1c, c\u00e1ch \u0111\u1ed5i \u0111\u01a1n v\u1ecb (nh\u00e2n\/chia cho 3,6) v\u00e0 ph\u00e2n bi\u1ec7t v\u1eadn t\u1ed1c trung b\u00ecnh v\u1edbi v\u1eadn t\u1ed1c t\u1ee9c th\u1eddi, b\u1ea1n s\u1ebd gi\u1ea3i nhanh h\u1ea7u h\u1ebft b\u00e0i to\u00e1n chuy\u1ec3n \u0111\u1ed9ng. \u0110\u1ec3 h\u1ecdc th\u00eam, m\u1eddi b\u1ea1n tham kh\u1ea3o c\u00e1c b\u00e0i <strong><a href=\"https:\/\/hoanghamobile.com\/tin-tuc\/cong-thuc-tinh-quang-duong\/\">c\u00f4ng th\u1ee9c t\u00ednh qu\u00e3ng \u0111\u01b0\u1eddng<\/a>, <a href=\"https:\/\/hoanghamobile.com\/tin-tuc\/1-dam-bang-bao-nhieu-km\/\">1 d\u1eb7m b\u1eb1ng bao nhi\u00eau km<\/a><\/strong> v\u00e0 <strong><a href=\"https:\/\/hoanghamobile.com\/tin-tuc\/1-nam-anh-sang-bang-bao-nhieu-km\/\">m\u1ed9t n\u0103m \u00e1nh s\u00e1ng b\u1eb1ng bao nhi\u00eau km<\/a><\/strong> tr\u00ean chuy\u00ean m\u1ee5c tin t\u1ee9c c\u1ee7a Ho\u00e0ng H\u00e0 Mobile.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>C\u00f4ng th\u1ee9c t\u00ednh v\u1eadn t\u1ed1c l\u00e0 v = s\/t, trong \u0111\u00f3 v l\u00e0 v\u1eadn t\u1ed1c, s l\u00e0 qu\u00e3ng \u0111\u01b0\u1eddng v\u1eadt \u0111i \u0111\u01b0\u1ee3c v\u00e0 t l\u00e0 th\u1eddi gian \u0111\u1ec3 \u0111i h\u1ebft qu\u00e3ng \u0111\u01b0\u1eddng \u0111\u00f3. \u0110\u00e2y l\u00e0 c\u00f4ng th\u1ee9c n\u1ec1n t\u1ea3ng c\u1ee7a c\u00e1c b\u00e0i to\u00e1n chuy\u1ec3n \u0111\u1ed9ng, xu\u1ea5t hi\u1ec7n xuy\u00ean su\u1ed1t t\u1eeb ch\u01b0\u01a1ng tr\u00ecnh To\u00e1n ti\u1ec3u h\u1ecdc [&hellip;]<\/p>\n","protected":false},"author":65,"featured_media":567742,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_yoast_wpseo_focuskw":"c\u00f4ng th\u1ee9c t\u00ednh v\u1eadn t\u1ed1c","_yoast_wpseo_title":"C\u00f4ng th\u1ee9c t\u00ednh v\u1eadn t\u1ed1c: v = s\/t, \u0111\u1ed5i \u0111\u01a1n v\u1ecb v\u00e0 b\u00e0i t\u1eadp","_yoast_wpseo_metadesc":"C\u00f4ng th\u1ee9c t\u00ednh v\u1eadn t\u1ed1c l\u00e0 v = s\/t: \u00fd ngh\u0129a, \u0111\u01a1n v\u1ecb m\/s v\u00e0 km\/h, c\u00e1ch \u0111\u1ed5i, b\u1ea3ng quy \u0111\u1ed5i c\u00f9ng v\u00ed d\u1ee5 c\u00f3 l\u1eddi gi\u1ea3i chi ti\u1ebft. Xem ngay t\u1ea1i Ho\u00e0ng H\u00e0 Mobile.","footnotes":""},"categories":[16],"tags":[],"class_list":["post-567226","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-thu-thuat"],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v27.3 (Yoast SEO v27.4) - https:\/\/yoast.com\/product\/yoast-seo-premium-wordpress\/ -->\n<title>C\u00f4ng th\u1ee9c t\u00ednh v\u1eadn t\u1ed1c: v = s\/t, \u0111\u1ed5i \u0111\u01a1n v\u1ecb v\u00e0 b\u00e0i t\u1eadp<\/title>\n<meta name=\"description\" content=\"C\u00f4ng th\u1ee9c t\u00ednh v\u1eadn t\u1ed1c l\u00e0 v = s\/t: \u00fd ngh\u0129a, \u0111\u01a1n v\u1ecb m\/s v\u00e0 km\/h, c\u00e1ch \u0111\u1ed5i, b\u1ea3ng quy \u0111\u1ed5i c\u00f9ng v\u00ed d\u1ee5 c\u00f3 l\u1eddi gi\u1ea3i chi ti\u1ebft. 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