SOLUTION: 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 Proportion

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Question 304987: 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?
Answer by josmiceli(19441) About Me  (Show Source):
You can put this solution on YOUR website!
20%5E2%2F17+=+40%5E2%2Fd
multiply both sides by 17d
400d+=+1600%2A17
400d+=+27200
d+=+68 ft