题目内容
一小球以
的速度水平抛出,在落地之前经过空中A、B两点.在A点小球速度方同与水平方同的夹角为
.在B点小球速度方同与水平方同的夹角为
(空气阻力忽略不计.g取
).以下判断中正确的足
A.小球经过A、B两点间的时间![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825002805331609.png)
B.小球经过A、B两点间的时间![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825002805347480.png)
c.A、B两点间的高度差![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825002805362540.png)
D.A、B两点间的高度差![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825002805378537.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825002805253648.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825002805269362.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825002805300382.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825002805315489.png)
A.小球经过A、B两点间的时间
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825002805331609.png)
B.小球经过A、B两点间的时间
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825002805347480.png)
c.A、B两点间的高度差
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825002805362540.png)
D.A、B两点间的高度差
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825002805378537.png)
AC
试题分析:平抛运动是水平方向匀速直线运动和竖直方向自由落体运动的合运动。水平速度
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825002805253648.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825002805409501.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825002805425830.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825002805440845.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825002805456447.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825002805471543.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825002805331609.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825002805503650.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825002805534565.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825002805549592.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825002805362540.png)
![](http://thumb2018.1010pic.com/images/loading.gif)
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