题目内容
如图所示,光滑水平面上有大小相同的A、B两球在同一直线上运动。两球质量关系为
,规定向右为正方向,A、B两球的动量均为+
,运动中两球发生碰撞,碰撞后A球的动量增量为
,则( )
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241346015312371.png)
A.左方是A球,碰撞后A、B两球速度大小之比为![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824134601594347.png)
B.左方是A球,碰撞后A、B两球速度大小之比为![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824134601625294.png)
C.右方是A球,碰撞后A、B两球速度大小之比为![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824134601594347.png)
D.右方是A球,碰撞后A、B两球速度大小之比为![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824134601625294.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824134601422501.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824134601453571.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824134601500558.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241346015312371.png)
A.左方是A球,碰撞后A、B两球速度大小之比为
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824134601594347.png)
B.左方是A球,碰撞后A、B两球速度大小之比为
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824134601625294.png)
C.右方是A球,碰撞后A、B两球速度大小之比为
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824134601594347.png)
D.右方是A球,碰撞后A、B两球速度大小之比为
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824134601625294.png)
A
同向运动的两个小球发生碰撞,则后面的小球的速度一定减小,前面的小球速度一定增大,所以左方是A球,右方是B球,
,
,又知道
,可得碰撞后A、B两球速度大小之比为
,所以A正确。
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824134601750918.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824134601781891.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824134601422501.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824134601594347.png)
![](http://thumb2018.1010pic.com/images/loading.gif)
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