题目内容
如图所示,光滑斜面上的四段距离相等,质点从O点由静止开始下滑,做匀加速直线运动,先后通过a、b、c、d…,下列说法正确的是
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/201408250019097042221.jpg)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/201408250019097042221.jpg)
A.质点由O到达各点的时间之比ta:tb:tc:td=1:![]() ![]() |
B.质点通过各点的速率之比va:vb:vc:vd=1:![]() ![]() |
C.在斜面上运动的平均速度![]() |
D.在斜面上运动的平均速度![]() |
ABD
试题分析:根据x=
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825001909954338.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825001909969642.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825001909798339.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825001909813344.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825001910032559.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825001909798339.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825001909813344.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825001909922270.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825001910172693.png)
![](http://thumb2018.1010pic.com/images/loading.gif)
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