m1v1+m2v2＝m1v1′+m2v2′任何時候都成立。你那Ft=m1v1+m2v2反而不倫不類。

來源: UberAlles 於 2010-04-05 17:17:59 [博客] [舊帖] [給我悄悄話] 本文已被閱讀：次

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