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QUESTION
The stopping distance d of a car after the brakes are applied varies directly as square of the speed r.
The stopping distance d of a car after the brakes are applied varies directly as square of the speed r. If a car travelling 70 mph can stop in 270 ft, how many feet will it take the same car to stop when it is travelling 20 mph? ft
Solution:The stopping distance d of a car after the brakes are applied varies directly as the squareof the speed r.--d = kr^2--Solve for "k" using "a car travelling 70 mph can...