题目内容
如图所示,物体A、B的质量分别为m、2m,物体B置于水平面上,B物体上部半圆型槽的半径为R,将物体A从圆槽的右侧最顶端由静止释放,一切摩擦均不计。则
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/201408250027170645257.jpg)
A.A不能到达B圆槽的左侧最高点
B.A运动到圆槽的最低点速度为![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825002717080508.png)
C.B一直向右运动
D.B向右运动的最大位移大小为![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825002717096482.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/201408250027170645257.jpg)
A.A不能到达B圆槽的左侧最高点
B.A运动到圆槽的最低点速度为
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825002717080508.png)
C.B一直向右运动
D.B向右运动的最大位移大小为
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825002717096482.png)
D
试题分析: AB组成的系统动量守恒,AB刚开始时动量为零,所以运动过程中总动量时刻为零,所以B先向右加速后又减速到零,因为系统机械能守恒,当B静止时,A运动恰好到左侧最高点,A错误,根据动量守恒定律可得
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825002717111727.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825002717127576.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/201408250027171421066.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825002717158598.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/201408250027171891030.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825002717205748.png)
![](http://thumb2018.1010pic.com/images/loading.gif)
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