SOLUTION: Solve for k, give the equation of variation, and solve the problem. The stopping distance "d" of a car after the brakes have been applied varies directly as the square of the spee

Question 861068: Solve for k, give the equation of variation, and solve the problem.
The stopping distance "d" of a car after the brakes have been applied varies directly as the square of the speed "r" if a car traveling 60 mph can stop in 200 feet, how fast can a car travel and still stop in 72 feet?
Answer by ewatrrr(24785) (Show Source): You can put this solution on YOUR website!

 

Hi,

Let k represent the constant of the direct variation

D = kr^2

2000/60^2 = k = .56

d = .56r^2

 = 11.3mph

 

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