m1v1+m2v2=m1v1'+m2v2',放之四海而皆准,当且仅当这两个物体组成一个封闭系统,就是说不受外力。
m1v1+m2v2=m1v1'+m2v2',放之四海而皆准,当且仅当这两个物体组成一个封闭系统,就是说不受外力。
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