不是说假定两个质心同时存在。那就变成另外一个系统了。
是如何标定质心的位置唯一。

【 在 bbsdma 的大作中提到: 】
: Wiki上质心的定义和性质：“In physics, the center of mass of a distribution of mass in space (sometimes referred to as the balance point) is the unique point where the weighted relative position of the distributed mass sums to zero. This is the point to wh
: ich a force may be applied to cause a linear acceleration without an angular acceleration.”
: 反证法之
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FROM 139.209.150.*