题目内容
质点做直线运动的位移x与时间t的关系为x=5t+2t2(各物理量均采用国际单位制单位),则该质点( )
A.初速度为5m/s |
B.前2 s内的平均速度是6m/s |
C.任意相邻的1 s内位移差都是4 m |
D.任意1 s内的速度增量都是2m/s |
AC
试题分析:匀变速直线运动的位移公式
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825002411596767.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825002411611557.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825002411627603.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825002411643622.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825002411627603.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825002411674773.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825002411689876.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825002411643622.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825002411721499.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825002411721499.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825002411752730.png)
![](http://thumb2018.1010pic.com/images/loading.gif)
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