题目内容
汽车由静止开始从A点沿直线ABC 作匀变速直线运动,第4s末通过B点时关闭发动机,再经6s到达C点时停止。已知AC的长度为30m,则下列说法正确的是
A.通过B点时速度的3m/s |
B.通过B点时速度是6m/s |
C.AB的长度为12m |
D.汽车在AB 段和 BC 段的平均速度相同 |
BCD
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/201408250004195042375.jpg)
试题分析:由汽车由静止开始从A点沿直线ABC作匀变速直线运动,画出
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825000419520352.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825000419613727.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825000419707350.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825000419754722.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825000419769603.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825000419785606.png)
![](http://thumb2018.1010pic.com/images/loading.gif)
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