题目内容
如图所示,光滑水平面上,AB两物体用轻弹簧连接在一起,A、B的质量分别为
、
,在拉力
作用下,AB共同做匀加速直线运动,加速度大小为
,某时刻突然撤去拉力
,此瞬时A和B的加速度大小为
和
,则( )
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824125111376960.png)
A.
,
B.
,![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824125111657746.png)
C.
,
D.
,![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824125111860671.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824125110768372.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824125110877394.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824125110908303.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824125110924287.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824125110908303.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824125111314315.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824125111345347.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824125111376960.png)
A.
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824125111470410.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824125111485439.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824125111517380.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824125111657746.png)
C.
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824125111688720.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824125111657746.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824125111517380.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824125111860671.png)
D
弹簧上的弹力不能突变,所以在撤去拉力的瞬间,A的受力情况没有变化,加速度依然为a,即
,对A根据牛顿第二定律,可知弹力大小为
,对B有:
,计算可得
,故应该选D
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824125111517380.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824125112234446.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824125112250576.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824125111860671.png)
![](http://thumb2018.1010pic.com/images/loading.gif)
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