SOLUTION: The stopping distasnce d of a car after the brakes are applied varries directly as the square of the speed r. If a car traveling 80mph can stop in 360 feet, how many feet will it t

Question 419922: The stopping distasnce d of a car after the brakes are applied varries directly as the square of the speed r. If a car traveling 80mph can stop in 360 feet, how many feet will it take the same car to stop wyhen it is traveling 30 mph?
Answer by stanbon(75887) (Show Source): You can put this solution on YOUR website!
The stopping distance d of a car after the brakes are applied varies directly as the square of the speed r.
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d = kr^2
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Solve for "k" using "a car traveling 80mph can stop in 360 feet"
360 = k*80^2
k = 0.05625
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How many feet will it take the same car to stop when it is traveling 30 mph?
d = 0.5625*30^2
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distance = 50.625 ft.
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Cheers,
Stan H.
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