algebra

The stooping distance d of a car after the brakes are appied varies directly as the square root of the speed r. If a car traveling 40mph can stop in 90 ft., how many feet will it take the same car to stop when it is traveling 60 mph.

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  1. d = kr^2
    90 = 1600k
    k = 9/160

    d(60) = 9/160 * 3600 = 202.5

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