题目内容
如图所示,质量为
的物体置于水平地面上,所受水平拉力F在2s时间内的变化图象如图甲所示,其运动的速度图象如图乙所示,g=10m/s2,下列说法正确的是( )
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824151442092144.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241514421551395.jpg)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241514421702579.jpg)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824151442014333.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824151442092144.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241514421551395.jpg)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241514421702579.jpg)
A.物体和地面之间的动摩擦因数为1 | B.2s内物体的加速度不变 |
C.2s末物体回到出发点 | D.水平拉力F的最大功率为10W |
A
试题分析:在减速阶段,
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824151442186575.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824151442451586.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824151442545416.png)
故选A,
点评:v-t图像的斜率表示加速度,图线围成的面积表示物体的位移,
![](http://thumb2018.1010pic.com/images/loading.gif)
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