题目内容
一架飞机在地面从静止加速到刚离开地面的过程中,在30秒内速度由0增加到324km/h,若认为飞机加速过程是匀加速的,则:( )
A.飞机的加速度是10.8m/s2 |
B.飞机的平均速度为162m/s |
C.飞机的跑道长至少是1300m |
D.飞机在15s时的瞬时速度是45m/s |
D
试题分析:由题意知:
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825002339616418.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825002339631870.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825002339647477.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/201408250023396621177.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/201408250023396781109.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/201408250023396941273.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825002339709527.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825002339740769.png)
![](http://thumb2018.1010pic.com/images/loading.gif)
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