题目内容
(3分)如图所示,某同学在做“研究匀变速直线运动”的实验中,由打点计时器得到表示小车运动过程的一条清晰纸带,纸带上两相邻计数点的时间间隔为
,其中
,
,
,
,![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825002643462668.png)
,则打A点时小车的瞬时速度大小是 m/s,计算小车运动的加速度的表达式为 .加速度大小是 m/s。。(计算结果保留两位有效数字)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/2014082500264350934961.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825002643368471.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825002643384650.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825002643400680.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825002643431664.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825002643446673.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825002643462668.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825002643493715.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/2014082500264350934961.png)
vA="0.86" m/s (1分),
(1分) ,a="0.64" m/s2(1分)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825002643524950.png)
试题分析:匀变速直线运动中间时刻的瞬时速度等于平均速度,所以
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/201408250026435401398.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825002643556521.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825002643571626.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825002643602629.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825002643618641.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825002643524950.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825002643649558.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825002643680576.png)
![](http://thumb2018.1010pic.com/images/loading.gif)
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