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OpenStudy (anonymous):
The stopping distance d of a car after the brakes are applied varies directly as the square of the speed r. If a car traveling 50 mph can stop in 140ft,. How many feet will it take the same car to stop when it is traveling 40 mph?
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OpenStudy (anonymous):
140=k*50^2 140=k*2500 k=140/2500 = 0.056 d=.056r^2 d=.056*40^2 d=89.6ft
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