题目内容
如图所示,质量为m的物体(可视为质点)以某一速度从A点冲上倾角为30°的固定斜面其运动的加速度大小为
,此物体在斜面上上升的最大高度为h,则在这个过程中物体( )
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/201408250015582294222.jpg)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825001558198434.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/201408250015582294222.jpg)
A.重力势能增加了![]() | B.克服摩擦力做功![]() |
C.动能损失了![]() | D.机械能损失了![]() |
CD
试题分析:物体所受的合外力为 F=ma=
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825001558307582.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825001558307582.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825001558338647.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825001558276388.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825001558292636.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825001558292636.png)
![](http://thumb2018.1010pic.com/images/loading.gif)
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题目内容
A.重力势能增加了![]() | B.克服摩擦力做功![]() |
C.动能损失了![]() | D.机械能损失了![]() |