题目内容
如图是某质点直线运动的速度-时间图象,则由图象可知( )
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/201408250012314512428.jpg)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/201408250012314512428.jpg)
A.质点在0~1s内的平均速度为2m/s |
B.质点在0~2s内的位移为3m |
C.质点在0~1s内的加速度大于2~4s内的加速度,且方向相反 |
D.质点在0~1s内的运动方向与2~4s内的运动方向相反 |
BC
试题分析:根据v-t图象可知,质点在0~1s内做匀加速直线运动,因此质点在0~1s内的平均速度为
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825001231466464.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825001231482567.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825001231498436.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825001231544455.png)
![](http://thumb2018.1010pic.com/images/loading.gif)
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