题目内容
一个质点做直线运动的v-t图像如图所示,则质点
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/201408250011301583654.jpg)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/201408250011301583654.jpg)
A.在0-7s的平均速度大小为1m/s |
B.在1-3s的位移与3-5s的位移相同 |
C.在第1s内受合外力大小是第5s内受合外力大小的2倍。 |
D.在第3s末回到0时刻所在的位置- |
C
试题分析:速度时间图像斜率代表加速度,斜率正负代表加速度方向,据此判断第1秒内,加速度
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825001130174652.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825001130190637.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825001130205503.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825001130236547.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825001130252540.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825001130268599.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825001130299799.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825001130236547.png)
![](http://thumb2018.1010pic.com/images/loading.gif)
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