题目内容
(11分)如图所示,将一个小球水平抛出,抛出点距水平地面的高度h=1.8m,小球抛出的初速度为
。不计空气阻力。取g=
。求:
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/201408250049579648130.png)
(1)小球从抛出到落地经历的时间t;
(2)小球落地点与抛出点的水平距离S;
(3)小球落地时的速度大小V。
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825004957933647.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825004957948584.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/201408250049579648130.png)
(1)小球从抛出到落地经历的时间t;
(2)小球落地点与抛出点的水平距离S;
(3)小球落地时的速度大小V。
0.6s 4.8m 10m/s
试题分析:(1)由
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825004957980673.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825004957995495.png)
(2)由
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825004958011551.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825004958026600.png)
小球着地时竖直分速度
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825004958042553.png)
小球着地时的速度大小
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825004958058721.png)
![](http://thumb2018.1010pic.com/images/loading.gif)
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