2. 外语
  3. DISTANCE TRAVELED BY A CAR ACCORDING TO THE CAR’S SPEED WHEN THE DRIVER IS SIGNALED TO STOP *Reaction time is

DISTANCE TRAVELED BY A CAR ACCORDING TO THE CAR’S SPEED WHEN THE DRIVER IS SIGNALED TO STOP *Reaction time is

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问题         DISTANCE TRAVELED BY A CAR ACCORDING TO THE CAR’S SPEED
                WHEN THE DRIVER IS SIGNALED TO STOP

*Reaction time is the time period that begins when the driver is signaled to stop and ends when the driver applies the brakes.
Note: Total stopping distance is the sum of the distance traveled during reaction time and the distance traveled after brakes have been applied.
The total stopping distance for the car traveling at 60 miles per hour is approximately what percent greater than the total stopping distance for the car traveling at 50 miles per hour?
选项 A、0.22
B、0.3
C、0.38
D、0.45
E、0.52
答案C
解析 To solve this problem you need to find the total stopping distance at 50 miles per hour and at 60 miles per hour, find their difference, and then express the difference as a percent of the shorter total stopping distance. You need to use both graphs to find the total stopping distances. At 50 miles per hour, the total stopping distance is approximately 55 + 137 = 192 feet; and at 60 miles per hour it is approximately 66 + 198 = 264 feet. The difference of 72 feet as a percent of 192 feet is 72/192= 0.375, or approximately 38%. The correct answer is Choice C.
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