题目内容
如图,某同学为了找出平抛运动的物体初速度之间的关系,用一个小球在O点对准前方的一块竖直放置的挡板,O与A在同一高度,小球的水平初速度分别为v1、v2、v3,不计空气阻力,打在挡板上的位置分别是B、C、D,且AB∶BC∶CD=1∶3∶5。则v1、v2、v3之间的正确关系是:( )
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/201408250007270482194.jpg)
A.v1∶v2∶v3=3∶2∶1 B.v1∶v2∶v3=5∶3∶1
C.v1∶v2∶v3=6∶3∶2 D.v1∶v2∶v3=9∶4∶1
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/201408250007270482194.jpg)
A.v1∶v2∶v3=3∶2∶1 B.v1∶v2∶v3=5∶3∶1
C.v1∶v2∶v3=6∶3∶2 D.v1∶v2∶v3=9∶4∶1
C
试题分析:由平抛运动规律,
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825000727063492.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825000727079646.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825000727094785.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/201408250007271101092.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825000727126789.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825000727141681.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825000727157700.png)
![](http://thumb2018.1010pic.com/images/loading.gif)
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