题目内容
一物体自t=0时开始做直线运动,其速度图线如图所示。下列选项正确的是
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241507270543490.jpg)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241507270543490.jpg)
A.在0~6s内,物体离出发点最远为35m |
B.在0~6s内,物体经过的路程为40m |
C.在0~6s内,物体的平均速度为7.5m/s |
D.在5~6s内,物体做减速运动 |
AB
试题分析:0~5s,物体向正向运动,5~6s向负向运动,故5s末离出发点最远,路程为
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241507270701266.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241507271791617.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824150727257989.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241507273661047.png)
点评:要明确斜率的含义,知道在速度--时间图象中图象与坐标轴围成的面积的含义,能根据图象读取有用信息,要注意路程和位移的区别,属于基础题.
![](http://thumb2018.1010pic.com/images/loading.gif)
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