SOLUTION: The stopping distance, d, of a particular car after the brakes are applied varies directly as the square of the rate, r. If the car is travelling 40 mph, it can stop in 80 feet. Ho
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Question 1083583: The stopping distance, d, of a particular car after the brakes are applied varies directly as the square of the rate, r. If the car is travelling 40 mph, it can stop in 80 feet. How many feet will it take the same car to stop when it is travelling 80 mph?
Answer by Boreal(15235) (Show Source): You can put this solution on YOUR website!
d=kr^2
80=k^40^2, solve for k
80/1600=k=0.05
use k in second part
d=k*80^2=0.05*6400
d=320 feet
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