题目内容
质点做直线运动的位移x与时间t的关系为
各物理量均采用国际单位制单位),则该质点( )
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824194431442571.png)
A.第1s内的位移是5m | B.第2s末的速度是7m/s |
C.任意1s内的速度增量都是2m/s | D.任意相邻1s内的位移差都是1m |
C
试题分析:将t=1s带入
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824194432237544.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824194433189499.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824194434203766.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824194435061603.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824194435997678.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824194436683983.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824194435997678.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824194438306613.png)
故选C
点评:本题考查对匀变速直线运动位移公式的掌握程度和应用能力,以及对加速度的理解能力,常见题型.
![](http://thumb2018.1010pic.com/images/loading.gif)
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