Now I want to continue a case whereby I have a completely elastic collision.
我要继续此例，我有一个完全弹性碰撞。
I will often call it a completely elastic collision, which is really not necessary.
我常叫它完全弹性碰撞，但其实并不需要这样叫。
I told you I chose the case of - a completely elastic collision — Q and so kinetic energy must be conserved.
我说我选择这个例子，它是完全弹性碰撞-，为0,Q, is, zero——，那么动能必然守恒。
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。
A measurement method of impact energy is proposed for the situations of perfect elastic collision and completely inelastic collision.
提出完全弹性碰撞和完全非弹性碰撞情况下冲击能测量原理。
A measurement method of impact energy is proposed for the situations of perfect elastic collision and completely inelastic collision.
提出完全弹性碰撞和完全非弹性碰撞情况下冲击能测量原理。
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