题目内容
汽车由静止开始在平直的公路上行驶,0~60s内汽车的加速度随时间变化的图像如图2所示。则该汽车在0~60s内的速度-时间图像(即v-t图像)为图3中的( )
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/201408250003568532644.jpg)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/201408250003569788491.jpg)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/201408250003568532644.jpg)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/201408250003569788491.jpg)
B
0—10s内物体做加速度为2
的加速运动,根据
,可知10s时速度达到20m/s,接下来10—40s做匀速运动,速度始终为20m/s,40——60s内,加速度方向相反,因此做减速运动,加速度-1
,经20s速度恰好减小到零
试题分析:
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825000356993512.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825000357009420.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825000356993512.png)
试题分析:
![](http://thumb2018.1010pic.com/images/loading.gif)
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