题目内容
质点做直线运动的v-t图象如图所示,规定向右为正方向,则该质点在前8 s内平均速度的大小和方向分别为( )
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/201408250015130983328.jpg)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/201408250015130983328.jpg)
A.0.25 m/s 向右 | B.0.25 m/s 向左 |
C.1 m/s 向右 | D.1 m/s 向左 |
B
试题分析:速度时间图像与时间轴所围成的面积表示位移,前3秒面积在时间轴以上位移为正即
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825001513114773.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825001513130777.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825001513145669.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825001513223888.png)
![](http://thumb2018.1010pic.com/images/loading.gif)
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题目内容
A.0.25 m/s 向右 | B.0.25 m/s 向左 |
C.1 m/s 向右 | D.1 m/s 向左 |