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mvB?mvA??mvj?mvj??2mvj
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3??????F?5m(5?2t) ?SI????m???????t???????
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mv?mv0?20m
4??????m??m??????????E??E??????????????????[ ]
(A) 22mE, (B) 2mE? (C) 52mE?(D) 22?12mE?
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124mvmE?42mE ???4m?2?4E,?4mv2?2
?? P??2mE?42mE?32mE
????
5????????????????????r?4i?5j?6k ?SI? ???????
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W?F??r?(?3i?5j?9k)?(4i?5j?6k)??12?25?54?67J
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7????????????20g ???900??????????800m/s?????????????? [ ](A) 0.267N(B) 16N(C)240N (D)14400N
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8?????M????????????????????????????
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????????mv?
(M?m)V
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(0,2R)????????F??????? [ ]
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10????0.10kg????????????r?t3i?2j?SI??????t?0
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575
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1???????????????t = 0?????0 =5 rad/s?t = 20s???
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an??r?2r?? 2
3??????????????M?2.00 kg????R?0.100 m??????????????????????????????m?5.00 kg1????????????????????J?MR2????2
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d?d?d?d?
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123g 2??2L(1?sin?)
3g(1?sin?)
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