题目内容
光滑斜面长为L,一物体自斜面顶端由静止开始匀加速下滑到底端经历的时间为t,则( )
A.物体在![]() ![]() |
B.物体全过程的平均速度是![]() |
C.物体到斜面中点时的瞬时速度小于![]() |
D.物体从开始运动到斜面中点经历的时间为![]() |
B
试题分析:物体运动全程的平均速度为:
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825002408772474.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825002408523388.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825002408554362.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825002408835338.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825002408850503.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825002408866394.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825002408881336.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825002408554362.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825002408554362.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825002408835338.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825002408881336.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825002409115498.png)
![](http://thumb2018.1010pic.com/images/loading.gif)
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题目内容
A.物体在![]() ![]() |
B.物体全过程的平均速度是![]() |
C.物体到斜面中点时的瞬时速度小于![]() |
D.物体从开始运动到斜面中点经历的时间为![]() |