题目内容
如图所示,
,
,A与桌面动摩擦因数
, B与地面间的距离s=0.8m,由静止开始释放,运动过程中A未碰到滑轮,g=10m/s2,关于两者的运动情况,下列说法正确的是( )
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241329263435543.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824132926218643.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824132926265603.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824132926296513.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241329263435543.png)
A.B落到地面时的速度为1.79m/s |
B.B落到地面时的速度为0.8m/s |
C.B落地后,A在桌面上能继续滑行的距离为0.16m |
D.B落地后,A在桌面上能继续滑行的距离为0.8m |
BC
AB共同运动的加速度a,根据牛顿第二定律:
,
,B落到地面时的速度
,A错误、B正确;B落地后,A受到摩擦力作用,运动的加速度为
,能继续滑行的距离为
,C正确、D错误。
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824132926374961.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824132926421703.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824132926468920.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824132926484808.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824132926546957.png)
![](http://thumb2018.1010pic.com/images/loading.gif)
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