题目内容
质量为0.2 kg的物体在水平面上运动,它的两个正交分速度图线分别如图所示,由图可知
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408242318036202960.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408242318036202960.png)
A.最初4 s内物体的位移大小为8![]() |
B.5 s末物体的加速度大小为3 m/s2 |
C.从开始至6 s末物体先做曲线运动后做直线运动 |
D.从开始至6 s末物体所受合外力做的总功为 - 2 J |
AC
试题分析:由速度-时间图像,知最初4秒物体沿x方向做匀速直线运动,分位移
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824231806365653.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824231807832818.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824231809142918.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824231810593214.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824231812012993.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824231813635947.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824231814243915.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824231815725409.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824231816677792.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824231817706809.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824231810593214.png)
![](http://thumb2018.1010pic.com/images/loading.gif)
练习册系列答案
相关题目