Homework Help: math

Posted by Kaegan on Friday, September 17, 2010 at 7:39pm.

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?

math - Damon, Friday, September 17, 2010 at 7:55pm
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

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