题目内容
从某一高度相隔1秒先后释放两个相同的小球甲和乙,不计空气阻力,它们在空中下落的过程中:
A.两球距离始终保持不变 |
B.两球距离越来越大 |
C.速度之差保持不变 |
D.速度之差越来越大 |
BC
试题分析:设迟释放的小球的运动时间为t,则第一个小球的运动时间为
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824150818581324.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824150818659652.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824150818722803.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824150818784677.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241508188781097.png)
根据公式
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824150819018436.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824150819112597.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824150819221486.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824150819455469.png)
点评:自由落体运动是特殊的匀加速直线运动,匀变速直线运动的一切规律都适合自由落体运动,
![](http://thumb2018.1010pic.com/images/loading.gif)
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