题目内容
从地面竖直上抛一物体A,同时在离地面某一高度处有一物体B自由下落,两物体在空中同时到达同一高度时速度大小均为v,不计空气阻力,则下列说法正确的是
A.A上抛的初速度与B落地时速度大小相等,都是2v |
B.两物体在空中运动的时间相等 |
C.在两个物体落地之前,在任意相等的时间内两个物体的速度变化量相同 |
D.两物体在空中同时达到的同一高度处一定是B开始下落时高度的中点 |
AC
试题分析:A竖直上抛为匀减速运动
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825000026206522.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825000026221434.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825000026237618.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/201408250000262841048.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825000026299351.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825000026330759.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825000026346553.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825000026362774.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825000026377733.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825000026393872.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825000026408596.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825000026424365.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825000026440267.png)
![](http://thumb2018.1010pic.com/images/loading.gif)
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