题目

    It was a winter morning, just a couple of weeks before Christmas 2011. While most people were warming up their cars, Trevor, my husband, had to get up early to ride his bike four kilometers away from home to work. On arrival, he parked his bike outside the back door as he usually does. After working for ten hours, he returned to find his bike gone. The bike, a black Kona l8 speed, was our only transport. Trevor used it to get to work, putting in 60-hour weeks lo support his young family. And the bike was also used to get groceries(食品杂货)．saving us from having to walk lo利用打点计时器《探究小车的速度随时间变化的规律》，如图给出了某次实验中的纸带，其中0、1、2、3、4、5、6都为计数点，每相邻两个计数点的间还有四点（未画出），从纸带上测得：s1=1.50cm，s2=2..00cm，s3=2.50cm，s4=3.00cm，s5=4.00cm，s6=5.00cm．（1）通过纸带分析可知，小车的速度在 （填“增大”或“减小”）；（2）每相邻两个计数点的时间间隔是  s；（3）计数点0到计数点6之间的平均速度是 m/s．