题目内容
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 |
D
试题分析:由题意知初动量
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825001518153822.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825001518168862.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825001518184972.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825001518200947.png)
![](http://thumb2018.1010pic.com/images/loading.gif)
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