题目内容
(9分)某同学采用频闪摄影的方法做“探究平抛运动规律”实验,如图所示是他拍摄的一幅照片。已知O点为平抛运动的初始位置,照片上正方形每小格边长的实际值为5cm。利用该照片,可以求得连续两次闪光间隔的时间为 s,平抛物体的初速度为 m/s.小球在b点位置的速度为 m/s.(g取10m/s2)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/201408250026394221982.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/201408250026394221982.png)
0.1 , 1.5 ,2.5
试题分析: O为初始位置,小球竖直方向自由落体运动,从O到A有:
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825002639453732.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825002639468858.png)
水平方向匀速运动,因此有:
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825002639484605.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825002639500883.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825002639515976.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825002639531469.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/201408250026395461412.png)
![](http://thumb2018.1010pic.com/images/loading.gif)
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