题目内容
一物体做直线运动的位移时间关系为
,物体从计时起3s末的速度为( )
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824155805503632.png)
A.18m/s | B.28m/s | C.33m/s | D.48m/s |
D
试题分析:位移时间关系为
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824155805659776.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824155805846662.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824155805986655.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824155806174530.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824155806330627.png)
点评:明确运动学公式特点,熟练应用运动学公式和运动规律求解,对于所学运动学公式一定明确其各个物理量的物理意义,尤其是注意公式的矢量性.
![](http://thumb2018.1010pic.com/images/loading.gif)
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题目内容
A.18m/s | B.28m/s | C.33m/s | D.48m/s |