题目内容
如图所示,两个物体以相同大小的初始速度从O点同时分别向x轴正负方向水平抛出,它们的轨迹恰好是抛物线方程
,(曲率半径简单地理解,在曲线上一点附近与之重合的圆弧的最大半径)那么以下说法正确的是( )
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/201408250012412942838.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825001241263607.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/201408250012412942838.png)
A.初始速度为![]() |
B.初始速度为![]() |
C.O点的曲率半径为![]() |
D.O点的曲率半径为![]() |
AC
试题分析:由平抛运动的规律可知,,水平方向做匀速直线运动,竖直方向做自由落体运动,设初速度为
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825001241388323.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825001241404492.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825001241419646.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825001241435755.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825001241450679.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825001241466713.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825001241497363.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825001241513260.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825001241513260.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825001241544574.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825001241622757.png)
![](http://thumb2018.1010pic.com/images/loading.gif)
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