题目内容
如图所示,长度为L=6m、倾角θ=30°的斜面AB,在斜面顶端B向左水平抛出小球1、同时在底端A正上方某高度处水平向右抛出小球2,小球2垂直撞在斜面上的位置P,小球1也同时落在P点,则两球平抛下落的高度为__________,下落的时间为_______。(v1、v2为未知量)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/201408250050014743376.jpg)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/201408250050014743376.jpg)
1.8m 0.6s
试题分析:小球2做平抛运动,根据分位移公式,有:x=v2t ①,y=
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825005001490338.png)
tan60°=
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825005001505654.png)
联立①②③④解得:h=1.8m,t=0.6s
![](http://thumb2018.1010pic.com/images/loading.gif)
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