题目内容
如图甲所示,物体受到水平推力F的作用在粗糙水平面上做直线运动.通过力传感器和速度传感器监测到推力F、物体速度v随时间t变化的规律如图乙所示.取g=10 m/s2.则( )
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/201408250027569853373.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/201408250027569853373.png)
A.物体的质量m=1.0 kg |
B.物体与水平面间的动摩擦因数μ=0.20 |
C.第2秒内物体克服摩擦力做的功W=1.8J |
D.前2秒内推力F做功的平均功率![]() |
D
试题分析:第2s内,由
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825002757016360.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825002757032640.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825002757047687.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825002757079849.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825002757094633.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825002757110493.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825002757125459.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825002757141615.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825002757141761.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825002757157920.png)
![](http://thumb2018.1010pic.com/images/loading.gif)
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