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> 质量是1 kg的钢球,以5 m/s的速度水平向右运动，碰到墙壁后以3 m/s的速度被反向弹回。假设球与墙面接触的时间是0.1秒，设水平向右为正方向，则（） A．钢球的动量变化量为2kg•m/s B．钢球的动量变化量为－2kg•m/s C．墙面对钢球的冲量为8 kg•m/s D．墙面对钢球的冲量为－8 kg•m/s

问题：

发布时间：2024-09-13

质量是1 kg的钢球,以5 m/s的速度水平向右运动，碰到墙壁后以3 m/s的速度被反向弹回。假设球与墙面接触的时间是0.1秒，设水平向右为正方向，则（）

A．钢球的动量变化量为2kg•m/s

B．钢球的动量变化量为－2kg•m/s

C．墙面对钢球的冲量为8 kg•m/s

D．墙面对钢球的冲量为－8 kg•m/s

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提问用户：k5***law

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