math
posted by Kaegan .
The stopping distance of a car after the brakes are applied varies directly as the square of the speed r. If a car traveling 80 mph can stop in 360ft, how many feet will it take the same car to stoop when its traveling 50 mph?

d = k r^2
360 = k (80)^2
k = 360/80^2
d = [360/80^2] * 50^2
d = 360 (25/64)
d = 141 ft