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m1 m2

m1 m2

m1 m2

m1 m2

1

The momentum of each one individually is changing , but not the momentum of the system as a whole , and so this equals v prime .

每一个的动量，分别单独改变，但不是系统的动量，作为一个整体，等于 m1+m2 乘初速度。

2

and a switch (M1, M2) for selecting one of the first and second arms.

和用来选择第一和第二支路之一的开关（M1，M2 ）。

3

m1 Let this mass be m1 m2 and this mass be m2, and this surface is nearly frictionless.

让它的质量为 1 ，这是，表面几乎没有摩擦。

4

They get together , they stick together, and so I have here a velocity which I call v prime, m1+m2 and the mass is m1 plus m2.

它们相碰，粘在一起，我现在有个速度，我称它为 v ’，质量为。

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