题目内容
甲乙两车在一平直道路上同向运动,其
图像如图所示,图中
和
的面积分别为
和![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824154415628316.png)
。初始时,甲车在乙车前方
处。则下列说法错误的是( )
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241544160962177.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824154415145352.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824154415285528.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824154415347540.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824154415472283.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824154415628316.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824154415784532.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824154416034318.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241544160962177.png)
A.若![]() |
B.若![]() |
C.若![]() |
D.若![]() ![]() |
A
试题分析:由图线可知:在T时间内,甲车前进了
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824154415628316.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824154416954398.png)
A、若
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824154417095537.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824154417329399.png)
B、若
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824154417407554.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824154417500413.png)
CD、若
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824154417563555.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824154417625415.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824154417890561.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824154417968656.png)
故选A
点评:追和被追的两者的速度相等常是能追上、追不上、二者之间的距离有极值的临界条件.(1)在两个物体的追及过程中,当追者的速度小于被追者的速度时,两者的距离在增大; (2)当追者的速度大于被迫者的速度时,两者的距离在减小;(3)当两者的速度相等时,两者的间距有极值,是最大值还是最小值,视实际情况而定.
![](http://thumb2018.1010pic.com/images/loading.gif)
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