题目内容
如图所示,一高度为h的楔形物块固定在水平地面上,质量为m的物体由静止开始从倾角分别为α、β的两个光滑斜面的顶端滑下,则下列说法中正确的是
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/201408250014355491871.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/201408250014355491871.png)
A.物体滑到斜面底端的速度相同 |
B.物体滑到斜面底端所用的时间相同 |
C.物体滑到斜面底端时重力所做功的功率相同 |
D.物体滑到斜面底端过程中重力所做的功相同 |
D
试题分析:如图从两个光滑斜面顶端滑下,根据机械能守恒
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825001435565796.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825001435611628.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825001435627662.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825001435658595.png)
![](http://thumb2018.1010pic.com/images/loading.gif)
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