题目内容
一辆长为0.6m的电动小车沿水平面向右作匀变速直线运动,下图是某监测系统每隔2s拍摄的一组照片.用刻度尺测量照片上的长度,结果如图所示.则小车的加速度大小约为
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241600316136331.jpg)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241600316136331.jpg)
A.0.01 m/s2 | B.0.5 m/s2 | C.1 m/s2 | D.5 m/s2 |
B
试题分析:根据电动小车的长度为0.6m,按比例确定出电动小车第1个像与第2个像间的位移大小
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824160031644509.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824160031722554.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824160031878583.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241600320491271.png)
故选B
点评:根据电动小车的长度为0.6m,按比例确定出电动小车3个像之间的位移大小,由于做匀加速直线运动,根据
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824160031878583.png)
![](http://thumb2018.1010pic.com/images/loading.gif)
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