题目内容
如图所示,在高H=15m的建筑物顶部有一个高
的观景台A,观景台距楼
顶左侧边缘的水平距离为
.某人在观景台上用球棒将一个硬质小球,向左水平击出,球飞出时的速度口![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824130531983169.png)
,空气阻力忽略不计.试求:
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/2014082413053209243450.png)
小题1:小球落在距抛出点正下方的O点何处?
小题2:如果要使小球能够落到地面上,则小球击出时的水平初速度至少为多少?在此情况下小球落地点距墙根B的距离是多少?
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824130531843494.png)
顶左侧边缘的水平距离为
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824130531905593.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824130531983169.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824130532014649.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/2014082413053209243450.png)
小题1:小球落在距抛出点正下方的O点何处?
小题2:如果要使小球能够落到地面上,则小球击出时的水平初速度至少为多少?在此情况下小球落地点距墙根B的距离是多少?
小题1:
小题2:
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/2014082413053212329574.jpg)
![](http://thumb2018.1010pic.com/images/loading.gif)
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