图为王刚同学星期天乘坐出租车的发票。（1公里＝1km）
(1)王刚同学乘车这段时间内，这辆出租车是否做匀速直线运动？
(2)王刚同学乘该出租车行驶的时间为多少分钟？
(3)请计算王刚同学所乘出租车的平均速度是多少？
（1）不是（2）8分钟（3）8.3m/s
题目分析：匀速直线运动是速度不变的直线运动，由于出租车在起步和停车时，速度都在发生变化，而且该车在行驶过程中也不可能总是沿直线行驶，所以该车不做匀速直线运动；由图可知，出租车行驶的时间是8分钟；平均速度可以用公式
求得；
点评：解决本题的关键是能够从车票中读取有用的信息，然后会根据速度公式进行运算。
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| I love music, but we hear too much of it in today's society. I mean, have you tried 1 an insurance company lately? If you are kept 2 , you'll be forced to 3 some country or easy-listening type drivel (废话). Call your doctor's office, and the same thing 4 . How many times do you want to hear Eine Kleine Nacht's 5 in the daytime or "Winter" from Vivadi's Four Seasons in the spring? 6 , I've always thought that Handel's music was 7 and Vivadi's music was dull next to Handel's. I don't know how all this force-fed music got 8 . I suppose it was the background music in elevators. A few years ago, the governor of Georgia got the 9 that classical music was good for a 10 brain development. He actually got the legislature to appropriate (拨专款) enough money to give every new mother a 11 music tape to take home with her. And you know 12 was probably on it? Eine Kleine Nacht's music and "Winter". I'll bet that those 13 have done more to make babies 14 classical music than all the music appreciation 15 ever taught. And how about when you make a business call from you 16 and are forced to hear music while you have to wait to be 17 ? You can't put the call on speakerphone, because the 18 would disturb the people around you, 19 you're just left there holding the phone. You can't 20 , because the music is blasting in your ear. I love music-but enough is enough. | ||||
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