题目内容
某质点做匀变速直线运动,第3秒内的位移是6 m,第7秒内的位移是10m,则下列说法中正确的是
A.质点的初速度是3.5 m/s |
B.质点运动的加速度是1 m/s2 |
C.质点运动的加速度是4 m/s2 |
D.质点在4.5秒末的瞬时速度是8 m/s |
ABD
试题分析:根据匀变速直线运动的推论
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825001554891583.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825001554906659.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825001554922767.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825001554938409.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825001554953528.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825001554969527.png)
![](http://thumb2018.1010pic.com/images/loading.gif)
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