题目内容
如图所示,在地面上以速度υ0抛出质量为m的物体,抛出后物体落在比地面低h的海平面上,若以地面为零势能面,且不计空气阻力,则( )
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/201408250009133774448.jpg)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/201408250009133774448.jpg)
A.物体在海平面的重力势能为mgh |
B.重力对物体做的功为mgh |
C.物体在海平面上的机械能为![]() |
D.物体在海平面上的动能为![]() |
BD
试题分析:以地面为零势能面,海平面在地面以下高h 处,高度为
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825000913440320.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825000913455487.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825000913471313.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825000913487476.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825000913502621.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825000913502959.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825000913533730.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825000913455487.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/201408250009135491134.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825000913565976.png)
![](http://thumb2018.1010pic.com/images/loading.gif)
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