问题:
发布时间:2020-03-13
质量为
的物体以初速度
开始做平抛运动,经过时间
,下降的高度为
,速度变为
,则这段时间内物体动量变化大小为( )
A.![](http://picflow.koolearn.com/upload/papers//20140824/20140824122322361398.gif)
B.![](http://picflow.koolearn.com/upload/papers//20140824/20140824122322376348.gif)
C.![](http://picflow.koolearn.com/upload/papers//20140824/20140824122322392434.gif)
D.![](http://picflow.koolearn.com/upload/papers//20140824/20140824122322392404.gif)
质量为
![](http://picflow.koolearn.com/upload/papers//20140824/20140824122322298312.gif)
![](http://picflow.koolearn.com/upload/papers//20140824/20140824122322314321.gif)
![](http://picflow.koolearn.com/upload/papers//20140824/20140824122322329302.gif)
![](http://picflow.koolearn.com/upload/papers//20140824/20140824122322329312.gif)
![](http://picflow.koolearn.com/upload/papers//20140824/20140824122322345304.gif)
A.![]() |
B.![]() |
C.![]() |
D.![]() |
参考答案: