题目内容
一个做匀加速直线运动的物体,先后经过A、B两点时的速度分别是v和7v,经过AB的时间是t,则下列判断中正确的是( )
A.经过A、B中点的速度是4v
B.经过A、B中间时刻的速度是4v
C.前
时间通过的位移比后
时间通过的位移少1.5vt
D.前
位移所需时间是后
位移所需时间的2倍
A.经过A、B中点的速度是4v
B.经过A、B中间时刻的速度是4v
C.前
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825002228901340.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825002228901340.png)
D.前
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825002228916339.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825002228916339.png)
BCD
试题分析:设中间位置的速度为v1,根据公式v2?vA2=2a·
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825002228948401.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825002228948401.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/201408250022289791009.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825002229010762.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825002229010390.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/201408250022290261000.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825002229010390.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/201408250022290721088.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825002229010390.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825002229010390.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825002229135689.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825002229228743.png)
![](http://thumb2018.1010pic.com/images/loading.gif)
练习册系列答案
相关题目