题目内容
甲、乙、丙三物体的质量之比m甲∶m乙∶m丙=1∶2∶3,它们沿水平面以一定的初速度在摩擦力的作用下减速滑行到停下,滑行距离分别为x甲、x乙、x丙。若它们与水平面间的动摩擦因数相同,初动能相同,则x甲∶x乙∶x丙为( )
A.1∶2∶3 | B.1∶1∶1 | C.6∶3∶2 | D.3∶2∶1 |
C
试题分析:因为
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824145559155817.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241455592331204.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824145559296767.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824145600294826.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824145600357910.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824145600466921.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824145600575971.png)
点评:在应用动能定理的时候一定要注意过程中始末状态
![](http://thumb2018.1010pic.com/images/loading.gif)
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题目内容
A.1∶2∶3 | B.1∶1∶1 | C.6∶3∶2 | D.3∶2∶1 |