题目内容
如图所示,一个质量为m的物体(可视为质点),由斜面底端的A点以某一初速度冲上倾角为300的固定斜面做匀减速直线运动,减速的加速度大小为g,物体沿斜面上升的最大高度为h,在此过程中
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/201408250025288002548.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/201408250025288002548.png)
A.重力势能增加了2mgh | B.机械能损失了mgh |
C.动能损失了mgh | D.系统生热![]() |
B
试题分析:据题意,物体上升高度为h,则重力势能增加量等于重力做的负功,即
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825002528831739.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825002528847797.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825002528863562.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/201408250025288631121.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825002528878988.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825002528909743.png)
![](http://thumb2018.1010pic.com/images/loading.gif)
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