题目内容
(10分)如图所示为某辆汽车制动过程的频闪照片,汽车匀速运动到A位置时照相机开始拍照,以后汽车沿直线向右运动的过程中,照相机每隔0.5 s拍照一次,且汽车到达B位置时开始制动.仔细观察频闪照片,求:
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/201408250015046595450.jpg)
(1) 汽车匀速运动时的速度大小;
(2) 汽车制动过程的加速度大小;
(3) 汽车从开始制动到静止所运动的距离.( 保留三位有效数字)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/201408250015046595450.jpg)
(1) 汽车匀速运动时的速度大小;
(2) 汽车制动过程的加速度大小;
(3) 汽车从开始制动到静止所运动的距离.( 保留三位有效数字)
(1)
(2)
(3)![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825001504721463.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825001504690588.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825001504706559.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825001504721463.png)
试题分析:(1)设汽车匀速运动速度为
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825001504752265.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825001504768587.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825001504784479.png)
则
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825001504815872.png)
(2)设汽车制动过程的加速度为
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825001504830283.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825001504846801.png)
其中
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825001504877634.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825001504784479.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825001504690588.png)
解得
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825001504706559.png)
(3)设汽车从刹车到停下来运动的距离为
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825001504940266.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/201408250015049861123.png)
![](http://thumb2018.1010pic.com/images/loading.gif)
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