题目内容
为了测定某轿车在平直路上启动阶段的加速度(轿车启动时的运动可近似看成是匀加速直线运动),某人拍摄一张在同一底片上多次曝光的照片,如图1-6-12所示,如果拍摄时每隔2 s曝光一次,轿车车身总长为4.5 m,那么这辆轿车的加速度为(
)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241321088112115.jpg)
图1-6-12
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824132108749164.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241321088112115.jpg)
图1-6-12
A.1 m/s2 | B.2.25 m/s2 |
C.3 m/s2 | D.4.25 m/s2 |
B
:选B.据匀变速直线运
动规律,Δx=x2-x1=aT2,读出x1、x2,代入即可计算.轿车总长4.5 m,相当于提示我们图中每一小格为1.5 m,由此可算出两段距离分别为x1=12 m和x2=21 m,又T=2 s,则a=== m/s2=2.25 m/s2.故选B.
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824132108827172.png)
![](http://thumb2018.1010pic.com/images/loading.gif)
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