题目内容
如图所示,质量为
速度为v的A球跟质量为3m的静止B球发生对心正碰,碰撞后B球的速度可能有不同的值,碰后B的速度可能为 ( )![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241252537122355.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824125253572346.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241252537122355.png)
A.0.8v |
B.0.6v |
C.0.4v |
D.0.2v |
C
试题分析:两球在碰撞过程中满足动量守恒
A、根据动量守恒有
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824125253744660.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824125253790480.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241252538221369.png)
B、理由同A,B错
C、根据动量守恒有
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824125253744660.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824125253931534.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241252539461400.png)
D、根据动量守恒有
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824125253744660.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824125253993513.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824125254024437.png)
故选C
点评:动量守恒碰后的速度满足:(1)动能不增加,(2)碰后速度同向后面的速度小,(3)动量碰撞前后守恒
![](http://thumb2018.1010pic.com/images/loading.gif)
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