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动量定理

> 如右图所示，在光滑水平面上质量分别为m A=2kg、m B=4kg，速率分别为v A=5m/s、v B=2m/s的A、B两小球沿同一直线相向运动( ) A．它们碰撞前的总动量是18kg·m/s，方向水平向右 B．它们碰撞后的总动量是18kg·m/s，方向水平向左 C．它们碰撞前的总动量是2kg·m/s，方向水平向右 D．它们碰撞后的总动量是2kg·m/s，方向水平向左

问题：

发布时间：2020-03-13

如右图所示，在光滑水平面上质量分别为m _A=2kg、m _B=4kg，速率分别为v _A=5m/s、v _B=2m/s的A、B两小球沿同一直线相向运动( )

A．它们碰撞前的总动量是18kg·m/s，方向水平向右
B．它们碰撞后的总动量是18kg·m/s，方向水平向左
C．它们碰撞前的总动量是2kg·m/s，方向水平向右
D．它们碰撞后的总动量是2kg·m/s，方向水平向左

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