题目内容
一辆汽车以20 m/s的速度沿平直的公路从甲地开往乙地,又以30 m/s的速度从乙地开往丙地.已知甲、乙两地间的距离与乙、丙两地间的距离相等,该汽车在从甲地开往丙地的过程中平均速度的大小为
A.22 m/s | B.24 m/s | C.25m/s | D.28 m/s |
B
试题分析:设甲、乙两地间的距离为x,则汽车在甲、乙两地间运动时间t1=
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825002917341393.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825002917356424.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825002917372675.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825002917403597.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825002917419936.png)
![](http://thumb2018.1010pic.com/images/loading.gif)
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题目内容
A.22 m/s | B.24 m/s | C.25m/s | D.28 m/s |