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> 一个质量为2kg的小球以水平速度5m/s向右运动，与挡板碰撞后，以3m/s的水平速度反向弹回，则( ) A．它的动量变化量的大小为4kg·m/s B．它的动量变化量的大小为16kg·m/s C．它的动量变化量的方向与初动量方向相反 D．它的动量变化量的方向与初动量方向相同

问题：

发布时间：2024-09-07

一个质量为2kg的小球以水平速度5m/s向右运动，与挡板碰撞后，以3m/s的水平速度反向弹回，则( )

A．它的动量变化量的大小为4kg·m/s

B．它的动量变化量的大小为16kg·m/s

C．它的动量变化量的方向与初动量方向相反

D．它的动量变化量的方向与初动量方向相同

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