题目

One morning Mr. Green is driving around the county and  1  a small bookshop. When he sees an old man  2  the side of the road, he stops his car and says to the old man, Excuse me, I want  3  to the Sun Bookshop. Do you know it? Yes, the old man answers, I  4  you the way. He  5  Mr. Green 's car, and they drive about twelve miles.  6  they come to a small house, the old man says, Stop here. Mr. Green stops and  7  the house. But this isn’t the  8  ,  he says to the old man. Right,” the old man answers .this is my house ,and now I'll show you the  9  to the book-sh如图为某同学在研究匀变速直线运动的实验中，用打点计时器打出的一条纸带，纸带上标出的A、B、C、D、E都是选中的记数点，每两个记数点间都有四个自然点没有画出．某同学用刻度尺只测出了A、B间和D、E的距离，s1=1.50cm和s4=7.50cm．求：（1）打C点时纸带（或小车）的运动速度大小为v=0.450.45m/s；（2）小车运动过程中的加速度大小为a=22m/s2．