题目内容
(14分)木块A以3m/s的速度滑上一长为2.4m、静止在水平面上的长木板B上。由于A、B之间的摩擦作用,A在B上做匀减速直线运动,B沿水平面向右做匀加速直线运动,已知B的加速度为0.5m/s2,A运动到B的中点时,A、B速度相等,此后A、B保持相对静止在水平面上匀速运动。求:
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/201408250020403252755.jpg)
(1)A在B上滑行时的加速度大小;
(2)A、B的最终速度大小.
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/201408250020403252755.jpg)
(1)A在B上滑行时的加速度大小;
(2)A、B的最终速度大小.
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825002040340630.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825002040356771.png)
试题分析:设A、B达到共同速度v经历的时间为t,A、B发生的位移分别为xA、xB,则:
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825002040371708.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825002040387686.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825002040403653.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825002040418503.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825002040434628.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825002040340630.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825002040356771.png)
![](http://thumb2018.1010pic.com/images/loading.gif)
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