This paper analyses the two body problem of kinematical equation and discusses the elastic collision between two particles in the center of mass system.
用质心坐标系分析了二体问题的运动方程，并用质心系讨论了两个粒子间的弹性碰撞问题。
Two circle round hole hammer body through the distance between the meet collision equilibrium condition.
两锤体圆透孔圆心之间的距离满足碰撞平衡条件。
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