题目内容
质量为1kg的小球从空中自由下落,与水平地面相碰后弹到空中某一高度,其速度随时间变化的关系如图所示,取
,则:
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/201408250007015422269.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825000701526664.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/201408250007015422269.png)
A.小球下落过程中的最大势能为12.5J |
B.小球下落过程中的最大速度为5m/s |
C.第一次反弹的最大动能为4.5J |
D.小球能弹起的最大高度为1.25m |
ABC
试题分析:小球在前0.8s内,释放点离地面最高,由图象的面积可知,小球在0.5s通过的位移为1.25m,
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825000701557815.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825000701573597.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825000701588608.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825000701604943.png)
![](http://thumb2018.1010pic.com/images/loading.gif)
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