题目内容
如图所示,
,
,
与桌面动摩擦因数
,
与地面间的距离s="0.8m," 、
原来静止,关于两者的运动情况,下列说法正确的是
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408242014574873829.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824201452792629.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824201453478587.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824201454196297.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824201454898501.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824201455335304.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824201455335304.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408242014574873829.png)
A.![]() |
B.![]() |
C.![]() ![]() |
D.![]() ![]() |
BC
试题分析:由动能定理可得:
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408242015025261213.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824201503696636.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824201504804865.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824201505787576.png)
故选BC.
点评:本题为动能定理的简单应用,注意灵活选择研究对象即可求解.
![](http://thumb2018.1010pic.com/images/loading.gif)
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