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that，m1，times，u1，prime

that，m1，times，u1，prime

that，m1，times，u1，prime

that，m1，times，u1，prime

1

Now, I know that momentum is zero, so I only can write down for this situation after the collision m1 0 plus m2 times u2 prime must be zero.

动量为，我只能写下这种情况，在碰撞之后，乘以 u1 ’，that，m1，times，u1，prime ，加 m2 乘 u2 ’必为。

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