题目内容
(15分)如图所示,飞机距地面高为H=500 m,v1=100 m/s,追击一辆速度为v2=20 m/s的同向行驶的汽车,欲使投弹击中汽车,飞机应在距汽车多远处投弹?(g取10 m/s2,不计空气阻力)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/201408250037072602908.jpg)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/201408250037072602908.jpg)
800 m
由H=
gt2,得t=
,
炸弹下落时间t=
s=10 s,
由水平方向的位移关系知:v1t-v2t=s.
解得s=800 m.
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825003707276338.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825003707291578.png)
炸弹下落时间t=
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825003707323677.png)
由水平方向的位移关系知:v1t-v2t=s.
解得s=800 m.
![](http://thumb2018.1010pic.com/images/loading.gif)
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