2. 外语
  3. Andrew fitted an electric toy car with hard rubber wheels that had deep treads and placed the car on a smooth, flat surface. And

Andrew fitted an electric toy car with hard rubber wheels that had deep treads and placed the car on a smooth, flat surface. And

admin2013-05-19  62
问题 Andrew fitted an electric toy car with hard rubber wheels that had deep treads and placed the car on a smooth, flat surface. Andrew started the car and a stopwatch at the same time. Andrew stopped the stopwatch as the car crossed the 75-foot mark. He calculated the results of 3 separate trials as shown in the table below.

Andrew repeated the procedure, except he fitted the car with soft rubber wheels that were smooth and lacked treads. The results are shown in the table below.

Assuming that the car traveled at a constant speed, approximately how far had the car with hard wheels traveled in Trial 3 after 11.25 seconds?
选项 A、22.5 feet
B、37.5 feet
C、75.0 feet
D、253.125 feet
E、Not enough information is given.
答案B
解析 The correct answer is B. Since the car traveled at a constant speed, you can set up a proportion between the time and distance of the whole run and the time and distance of the partial run.

75x11.25 = 22.5x
843.75 = 22.5x
37.5=x
Therefore, the car traveled 37.5 feet in 11.25 seconds.
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