题目内容
如图所示,光滑水平面上的木板右端,有一根轻质弹簧沿水平方向与木板相连,木板质量M=3.0kg。质量m=1.0kg的铁块以水平速度
=4.0m/s,从木板的左端沿板面向右滑行,压缩弹簧后又被弹回,最后恰好停在木板的左端.则在上述过程中弹簧具有的最大弹性势能为
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/201408250012465521822.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825001246427323.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/201408250012465521822.png)
A.3.0J | B.4.0J | C.6.0J | D.20J |
A
试题分析:据题意,当m向右运动过程中,由于摩擦力作用,m做减速运动,M做加速运动,压缩弹簧过程也是由于弹力作用,继续类似运动,知道两者速度相等时,弹簧压缩到最短,设此时速度为v1,据动量守恒定律有:
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825001246567804.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825001246583580.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825001246630829.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825001246661589.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/201408250012466771292.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/201408250012466921252.png)
![](http://thumb2018.1010pic.com/images/loading.gif)
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