题目内容
物体在变力F作用下沿水平方向做直线运动,物体质量m=10kg,F随坐标x的变化情况如图所示。若物体在坐标原点处由静止出发,不计一切摩擦。借鉴教科书中学习直线运动时由v-t图象求位移的方法,结合其他所学知识,根据图示的F-x图象,可求出物体运动到x=16 m处时,速度大小为( )
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/201408250022475903757.jpg)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/201408250022475903757.jpg)
A.3 m/s | B.4 m/s | C.2![]() | D.![]() |
C
试题分析:在0-4m位移内F恒定,物体做匀加速直线运动,根据牛顿第二定律得;
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825002247636775.png)
根据
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825002247652671.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825002247668706.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/201408250022476831497.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825002247699617.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825002247714737.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825002247730807.png)
![](http://thumb2018.1010pic.com/images/loading.gif)
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