题目内容
一个滑雪运动员从短坡顶端开始由静止匀加速滑下,短坡长度为9米,运动员经3秒滑至底端。求:(1)运动员在第1秒内下滑的距离为多少?
(2)运动员在最后1秒内下滑了多大距离? (10分)
(2)运动员在最后1秒内下滑了多大距离? (10分)
(1)运动员匀加速下滑,全程有
其中坡长
,
代入得![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824123437733427.gif)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824123437748128.gif)
第一秒内位移
(共6分)
(2)最后一秒的位移
,其中
代入得
(共4分)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824123437686457.gif)
其中坡长
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824123437701388.gif)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824123437717242.gif)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824123437733427.gif)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824123437748128.gif)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/2014082412343776485.gif)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824123437779555.gif)
(2)最后一秒的位移
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824123437779602.gif)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824123437811455.gif)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824123437826389.gif)
略
![](http://thumb2018.1010pic.com/images/loading.gif)
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