题目内容
某物体做直线运动的位移与时间变化的关系式为x=4t+2t2,x与t的单位分别m和s,则物体的初速度和加速度分别是
A.4m/s和2m/s2 | B.2m/s和2m/s2 |
C.4m/s和4m/s2 | D.4m/s和1m/s2 |
C
试题分析:对照匀变速运动位移与时间关系
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825001548963766.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825001549025621.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825001549041669.png)
![](http://thumb2018.1010pic.com/images/loading.gif)
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题目内容
A.4m/s和2m/s2 | B.2m/s和2m/s2 |
C.4m/s和4m/s2 | D.4m/s和1m/s2 |