题目内容
如图所示,在拉力F作用下,质量分别为m1、m2的A、B共同以加速度a光滑水平面上做匀加速直线运动,某时刻突然撤去拉力F,此瞬时A和B的加速度为a1和a2,则( )
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241455498421903.jpg)
A.a1=0,a2=0
B.a1=a,a2=0
C.a1=a,a2=-
a
D.a1=
a,a2=
a
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241455498421903.jpg)
A.a1=0,a2=0
B.a1=a,a2=0
C.a1=a,a2=-
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824145549873420.png)
D.a1=
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824145549983496.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824145550076506.png)
C
试题分析:撤去F前,对A有:
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824145550139535.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824145550263633.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824145550139535.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824145550716590.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824145550903674.png)
点评:本题的关键是弄清楚撤去F的瞬间,AB受到的力的变化
![](http://thumb2018.1010pic.com/images/loading.gif)
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