{"common":{"save":0,"post_id":"8777","level":2,"total":10,"point":10,"point_extra":0},"segment":[{"id":"8232","mon_id":"1158790","chapter_id":"1159772","post_id":"8777","question":"<p>M\u1ed9t v\u1eadt kh\u1ed1i l\u01b0\u1ee3ng 200 g c&oacute; \u0111\u1ed9ng n\u0103ng l&agrave;&nbsp;10 J. L\u1ea5y g = 10 m\/s&sup2;. Khi \u0111&oacute; v\u1eadn t\u1ed1c c\u1ee7a&nbsp;v\u1eadt l&agrave;:<\/p>","options":["<strong>A.<\/strong> 10 m\/s.","<strong>B.<\/strong> 100 m\/s.","<strong>C.<\/strong> 15 m\/s.","<strong>D.<\/strong> 20 m\/s."],"correct":"1","level":"2","hint":"","answer":"<p>Ch\u1ecdn&nbsp;<span style=\"color:#16a085;\"><strong>A.<\/strong>&nbsp;10 m\/s.<\/span><\/p><p>\u0110\u1ed5i: 200 g = 0,2 kg.<\/p><p>Ta c&oacute;:&nbsp;<span class=\"math-tex\">$W_\u0111=\\dfrac{1}{2}mv^2$<\/span>&nbsp;suy ra&nbsp;<span class=\"math-tex\">$v=\\sqrt{\\dfrac{2W_\u0111}{m}}=\\sqrt{\\dfrac{2.10}{0,2}}=10(m\/s)$<\/span>.<\/p><p>V\u1eady v\u1eadn t\u1ed1c c\u1ee7a v\u1eadt l&agrave; 10 m\/s.<\/p>","type":"choose","extra_type":"classic","user_id":"131","test":"0","date":"2025-04-07 09:34:56","option_type":"txt","len":1},{"id":"8233","mon_id":"1158790","chapter_id":"1159772","post_id":"8777","question":"<p>M\u1ed9t v\u1eadt kh\u1ed1i l\u01b0\u1ee3ng 2 kg c&oacute; th\u1ebf n\u0103ng 8 J&nbsp;\u0111\u1ed1i v\u1edbi m\u1eb7t \u0111\u1ea5t. L\u1ea5y g = 10m\/s&sup2;. Khi \u0111&oacute; v\u1eadt&nbsp;\u1edf \u0111\u1ed9 cao<\/p>","options":["<strong>A.<\/strong> 1,0 m.","<strong>B.<\/strong> 0,4 m.","<strong>C.<\/strong> 9,8 m.","<strong>D.<\/strong> 32 m."],"correct":"2","level":"2","hint":"","answer":"<p>Ch\u1ecdn&nbsp;<span style=\"color:#16a085;\"><strong>B.<\/strong>&nbsp;0,4 m.<\/span><\/p><p>Ch\u1ecdn m\u1ed1c t&iacute;nh th\u1ebf n\u0103ng \u1edf m\u1eb7t \u0111\u1ea5t.<\/p><p>Ta c&oacute;:&nbsp;<span class=\"math-tex\">$W_t=mgh$<\/span>&nbsp;suy ra&nbsp;<span class=\"math-tex\">$h=\\dfrac{W_t}{mg}=\\dfrac{8}{10.2}=0,4(m)$<\/span>.<\/p><p>V\u1eady khi \u0111&oacute; v\u1eadt \u1edf \u0111\u1ed9 cao 0,4 m.<\/p>","type":"choose","extra_type":"shape2","user_id":"131","test":"0","date":"2025-04-07 09:37:40","option_type":"txt","len":0},{"id":"8234","mon_id":"1158790","chapter_id":"1159772","post_id":"8777","question":"<p>Ch\u1ecdn ph\u01b0\u01a1ng &aacute;n <strong>\u0111&uacute;ng<\/strong>. \u0110&ocirc;\u0323ng n\u0103ng cu\u0309a&nbsp;m&ocirc;\u0323t v&acirc;\u0323t thay \u0111&ocirc;\u0309i khi v\u1eadt<\/p>","options":["<strong>A.<\/strong> chuy&ecirc;\u0309n \u0111&ocirc;\u0323ng th\u0103\u0309ng \u0111&ecirc;\u0300u.","<strong>B.<\/strong> chuy&ecirc;\u0309n \u0111&ocirc;\u0323ng tro\u0300n \u0111&ecirc;\u0300u.","<strong>C.<\/strong> chuy&ecirc;\u0309n \u0111&ocirc;\u0323ng v\u1edbi v\u1eadn t\u1ed1c kh&ocirc;ng \u0111\u1ed5i <span class=\"math-tex\">$v_o$<\/span>.","<strong>D.<\/strong> chuy&ecirc;\u0309n \u0111&ocirc;\u0323ng bi&ecirc;\u0301n \u0111&ocirc;\u0309i \u0111&ecirc;\u0300u."],"correct":"4","level":"2","hint":"","answer":"<p>Ch\u1ecdn&nbsp;<span style=\"color:#16a085;\"><strong>D.<\/strong>&nbsp;chuy&ecirc;\u0309n \u0111&ocirc;\u0323ng bi&ecirc;\u0301n \u0111&ocirc;\u0309i \u0111&ecirc;\u0300u.<\/span><\/p><p>C&aacute;c ph\u01b0\u01a1ng &aacute;n A, B, C &ndash; v\u1eadt c&oacute; v\u1eadn t\u1ed1c&nbsp;kh&ocirc;ng \u0111\u1ed5i&nbsp;&rArr; \u0110\u1ed9ng n\u0103ng c\u1ee7a v\u1eadt kh&ocirc;ng \u0111\u1ed5i.<\/p><p>Ph\u01b0\u01a1ng &aacute;n D - khi v\u1eadt chuy\u1ec3n \u0111\u1ed9ng bi\u1ebfn&nbsp;\u0111\u1ed5i \u0111\u1ec1u th&igrave; v\u1eadn t\u1ed1c c\u1ee7a v\u1eadt thay \u0111\u1ed5i (<span class=\"math-tex\">$v=v_o+at$<\/span>)<br \/>&rArr; \u0110\u1ed9ng n\u0103ng c\u0169ng thay \u0111\u1ed5i do \u0111\u1ed9ng n\u0103ng t\u1ec9 l\u1ec7 thu\u1eadn v\u1edbi b&igrave;nh ph\u01b0\u01a1ng v\u1eadn t\u1ed1c.<\/p>","type":"choose","extra_type":"classic","user_id":"131","test":"0","date":"2025-04-07 09:40:06","option_type":"math","len":0}]}