题目内容
一个做自由落体运动的物体,从开始运动起,连续通过三段位移的时间分别是1s、2s、3s,这三段位移的长度之比和这三段位移上的平均速度之比分别是
A.1:23:33 1:22:32 | B.1:22:32 1:2:3 | C.1:2:3 1:1:1 | D.1:3:5 1:2:3 |
A
试题分析:根据
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825001607917625.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825001607948646.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/201408250016079641082.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/201408250016080101343.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825001608026730.png)
在第一段位移的平均速度
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825001608042532.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825001608260586.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825001608276582.png)
故
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/201408250016082911142.png)
![](http://thumb2018.1010pic.com/images/loading.gif)
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