题目内容
有两辆完全相同的汽车,沿水平道路一前一后匀速行驶,速度均为v0,若前车突然以恒定的加速度a刹车,在它刚停止时,后车以加速度2a开始刹车,已知前车在刹车过程中行驶的路程为s,若要保证两辆车在上述情况下不发生碰撞,则两车在匀速行驶时保持的距离至少应为( )
A.s B1.5 s
C.2s D.![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824142620737448.png)
A.s B1.5 s
C.2s D.
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824142620737448.png)
B
前车匀减速;![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824142620784654.png)
后车先匀速后匀减速,![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824142620846745.png)
要保证两辆车不发生碰撞,![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824142621033788.png)
选B
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824142620784654.png)
后车先匀速后匀减速,
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824142620846745.png)
要保证两辆车不发生碰撞,
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824142621033788.png)
选B
![](http://thumb2018.1010pic.com/images/loading.gif)
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