题目内容
一物体做加速直线运动,依次通过A、B、C三点,AB=BC,物体在AB段的加速度为a1,在BC段的加速度为a2,且物体在B点的速度为VB=(VA+VC)/2,则
A.a1 > a2 B. a1 = a2 C. a1 < a2 D.不能确定
A.a1 > a2 B. a1 = a2 C. a1 < a2 D.不能确定
C
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/201408250031520156086.png)
试题分析:如果物体从A至C的过程中是作匀加速直线运动,则物体的速度图线如图1所示,∵B点是AC的中点,很显然可以看出图线下所对应的面积s1≠s2,要满足s1=s2的条件,时间t1必须要向右移至图2所示的位置,又∵vB=
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825003152031338.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825003152031338.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825003152031338.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825003152031338.png)
![](http://thumb2018.1010pic.com/images/loading.gif)
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