题目内容
一架战斗机完成任务以50m/s的速度着陆后做加速度大小为5m/s2的匀减速直线运动,求着陆后12s内的位移大小。
250m
解法一:飞机做匀减速直线运动,初速度
50m/s,加速度
,![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824115541878414.png)
由
得:
(4分)
,所以飞机做减速直线运动的时间为10s,停了2s(2分)
由
得:
(4分)
解法二:飞机做匀减速直线运动,初速度
50m/s,加速度
,![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824115541878414.png)
由
得:
(10分)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824115541753346.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824115541784621.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824115541878414.png)
由
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824115541925565.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241155419721235.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824115542096515.png)
由
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824115542128753.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241155421902187.png)
解法二:飞机做匀减速直线运动,初速度
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824115541753346.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824115541784621.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824115541878414.png)
由
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824115542299678.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241155423301638.png)
![](http://thumb2018.1010pic.com/images/loading.gif)
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