The general expression of composition of velocities for relativistic particle 相对论质点的一般速度合成公式
Based on the theorem for the composition of velocities in theoretical mechanics, the author gives out the demonstration of the theorem of three instantaneous centers of velocity in general conditions. 本文运用理论力学中运动学的速度合成定理,给出了一般情况下平面机构运动三心定理的求证过程。
If the speeds of these two frames are both equal to the speed of light, the composition of velocities is equal to the speed of light. 若惯性系中一个或两个的速度都等于光速,则合成速度也等于光速。