SAT I 一日一问:2012年12月3日

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Mathematics > Standard Multiple Choice

Read the following SAT test question and then click on a button to select your answer.

The stopping distance of a car is the number of feet that the car travels after the driver starts applying the brakes. The stopping distance of a certain car is directly proportional to the square of the speed of the car, in miles per hour, at the time the brakes are first applied. If the car’s stopping distance for an initial speed of  20 miles per hour is 17 feet, what is its stopping distance for an initial speed of 40 miles per hour?

(A) 34 feet
(B) 51 feet
(C) 60 feet
(D) 68 feet
(E) 85 feet 

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