题目内容
如图所示,两辆质量相同的平板小车
、
成一直线排列,静止在光滑水平地面上,原来静止在
车上的一个小孩跳到
,接着又立即从
跳回
车,他跳回a车并相对a车保持静止,此后 。(填选项前的字母)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408242328563874066.jpg)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824232850381283.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824232851473299.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824232850381283.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824232851473299.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824232851473299.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824232850381283.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408242328563874066.jpg)
A.![]() ![]() | B.![]() ![]() |
C.![]() ![]() | D.![]() ![]() |
C
试题分析:由小车ab及人组成的系统动量守恒,根据动量守恒定律
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824232903329886.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824232904234841.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824232850381283.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824232851473299.png)
![](http://thumb2018.1010pic.com/images/loading.gif)
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题目内容
A.![]() ![]() | B.![]() ![]() |
C.![]() ![]() | D.![]() ![]() |