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在一次物理复习课中,有的学生问道:“动量是矢量,其方向决定于速度的方向,应用动量守恒定律时,是否必须以同一参照物来确定系统内各物体的速度
In a physics review class, some students asked: “Momentum is a vector, and its direction is determined by the direction of the speed. When applying the law of conservation of momentum, must we use the same reference to determine the speed of various objects in the system?