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。
The momentum of each one individually is changing, but not the momentum of the system as a whole, and so this equals v prime.
在物理学中，运动的物体有两个特征与理解能量系统动力学相关：惯性和动量。
In physics, moving objects have two characteristics relevant to understanding the dynamics of energy systems: inertia and momentum.
毕竟，我们不只是说物体或人有动量；我们说的是整个系统都有动量。
After all, we don't speak only of objects or people as having momentum; we speak of entire systems having momentum.
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