题目内容
一个木块在水平桌面上滑动,它在滑动时的位移方程为
(其中,x单位为m,t单位为s)。则下面判断正确的是:
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825000644413543.png)
A.该物体在0-4s时间内经过的位移为8m |
B.该物体在0-4s时间内经过的位移为10m |
C.该物体在0-4s时间内经过的为位移9m |
D.该物体在0-4s时间内经过的路程为11m |
C
试题分析:根据表达式
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825000644413543.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825000644459636.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825000644475617.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825000644506607.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/201408250006445221005.png)
![](http://thumb2018.1010pic.com/images/loading.gif)
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