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0，Q，is，zero--

0，Q，is，zero--

0，Q，is，zero--

0，Q，is，zero--

2

And I take a case whereby - I have a completely elastic collision -- 0 that means Q is zero-- the kind that we have just discussed .

我采取这个例子，我有个完全弹性碰撞 -，意味着 Q 为 -，这是我们刚讨论过的。

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