题目内容
在以速度
匀速竖直上升的观光电梯中,一乘客竖直上抛一质量为
小球,电梯内的观察者看到小球经
到达最高点,而站在地面上的人看来(不计空气阻力的影响,重力加速度恒为
)( )
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825002022088265.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825002022104337.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825002022275330.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825002022291273.png)
A.在小球上升到最高点的过程中动量变化量大小为![]() |
B.在小球上升到最高点过程中克服重力做功为![]() |
C.电梯内观察小球到达最高点时其动能为![]() |
D.小球上升的初动能为![]() |
C
试题分析: 在电梯上人看到小球上升到最高点时,此时小球相对于电梯静止,上升速度与电梯速度相同为
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825002022088265.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825002022307464.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825002022416650.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825002022431797.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/201408250020224471009.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825002022088265.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825002022353586.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825002022494532.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825002022353586.png)
![](http://thumb2018.1010pic.com/images/loading.gif)
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