This paper analyses the twobodyproblem 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。
2
In center of mass system, solved problem of twobody had merits of symmetry form, brief description and high precision.
在质心系中，解决两体问题，具有形式对称，描述简洁，精确度高等优点。
3
The video concludes 'even though you don't break down the rubber polymers, your body has no problem moving that lump of gum through your digestive system and out the other end within a day or two.