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【简答题】
一质量为30 kg的物体以10 m·s -1 的速率水平向,另一质量为20 kg的物体以20 m·s -1 的速率水平向北运动。两物体发生完全非弹性碰撞后,它们的速度大小v=____ ____m/s ;(再考虑一下方向如何.)
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