题目内容
如图所示,将小球a从地面以初速度v0竖起上抛的同时,将另一相同质量的小球b从距地面h处由静止释放,两球恰在h/2处相遇(不计空气阻力),则( )
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825001058553942.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825001058553942.png)
A.两球同时落地 |
B.相遇时两球速度相等 |
C.从开始到相遇,球a动能的减少量等于球b动能的增加量 |
D.相遇后的任意时刻,重力对球a做功功率和对球b做功功率相等 |
C
试题分析:对a,有
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825001058568416.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825001058568339.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825001058568416.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825001058568339.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825001058615427.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825001058568416.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825001058568416.png)
![](http://thumb2018.1010pic.com/images/loading.gif)
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