题目

There is a popular belief that goldfish only have a three-second memory. But a 15-year-old schoolboy from Adelaide has just finished an experiment(实验) to tell us that it is not true. He shows everybody that the goldfish is smarter than we think. “I don’t believe that they had a three-second memory because animals need their memory, so they build up over time a knowledge of where the food is,” said Roy Stokes, a student at the Australian Science and MathematicsSchool. He did the experiment in small tank(鱼缸) of goldfish. “I decided to get a bit of red Logo and just feed the某汽车在刹车后行驶的距离s（单位：米）与时间t（单位：秒）之间的关系得部分数据如下表： （1）根据这些数据在给出的坐标系中画出相应的点；（2）选择适当的函数表示s与t之间的关系，求出相应的函数解析式；（3）①刹车后汽车行驶了多长距离才停止？②当t分别为t1，t2（t1＜t2）时，对应s的值分别为s1，s2，请比较与的大小，并解释比较结果的实际意义。