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某一高度,其速度时间关系如图所示,取g=10m/s2 ,则下列说法不正确的是()
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/201408250023173542180.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/201408250023173542180.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 |
D
试题分析:小球在刚开始运动时势能最大,
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/201408250023173541027.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/201408250023173861112.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/201408250023174011201.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/201408250023174171077.png)
![](http://thumb2018.1010pic.com/images/loading.gif)
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