题目内容
如图所示,一个物体由静止开始,从A点出发分别经三个不同的光滑斜面下滑到同一水平面上的C1、C2、C3处。下列说法正确的是( )
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/201408250008478092765.jpg)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/201408250008478092765.jpg)
A.物体在C1、C2、C3处的动能相等 |
B.物体在C1、C2、C3处的速度相等 |
C.物体在C1、C2、C3处重力的瞬时功率相等 |
D.物体沿三个斜面下滑的时间相等 |
A
试题分析:根据动能定理,
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825000847824812.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825000847840801.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825000847856303.png)
![](http://thumb2018.1010pic.com/images/loading.gif)
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