What do you think the situation is with the kinetic energy after the collision?
你认为是什么情况，碰撞后的动能怎样？
That's the situation after the collision.
这是碰撞后的情况。
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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