题目内容
如图所示为物体做直线运动的v-t图像。若将该物体的运动过程用x-t图像表示出来(其中x为物体相对出发点的位移),则下面四幅图描述正确的是( )![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241622204084477.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/2014082416222065812401.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241622204084477.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/2014082416222065812401.png)
C
试题分析:由速度时间图象可以看出物体在0到
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824162220798291.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824162220798291.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824162221391327.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824162221391327.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824162222093327.png)
A图象中第一段时间内的速度为负值,故A错误
B图象中第三段时间内物体的速度为正值,故B错误.
C由位移时间图象可以看出,物体在0到
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824162220798291.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824162220798291.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824162221391327.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824162221391327.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824162222093327.png)
D由其图象可以看出第一段时间内的斜率与第三段时间内的斜率大小不同,说明速度大小不同,故D错误.
故选:C
点评:理解位移-时间图象点和斜率的物理意义;理解好速度-时间图象的点、线、面的物理意义.
![](http://thumb2018.1010pic.com/images/loading.gif)
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