题目内容
如图所示,质量为m的物体沿动摩擦因数为μ的水平面以初速度从A点出发到B点时速度变为v,设同一物体以初速度v0从
点先经斜面
,后经斜面
到
点时速度变为v′,两斜面在水平面上投影长度之和等于AB的长度,则有( )
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/201408250000433818876.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825000043319321.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825000043319418.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825000043350414.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825000043366329.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/201408250000433818876.png)
A.v′>v. | B.v′=v. | C.v′<v. | D.不能确定 |
B
试题分析:在水平面上,由动能定理:-μmg·s=
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825000043412338.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825000043428619.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825000043412338.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825000043428619.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825000043412338.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825000043428619.png)
![](http://thumb2018.1010pic.com/images/loading.gif)
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题目内容
A.v′>v. | B.v′=v. | C.v′<v. | D.不能确定 |