The distance required for an emergency stop for a car varies directly as the square of the car’s speed. A car traveling at 50 mph requires 140 feet to stop. What is the stopping distance for a car traveling at 30 mph? What is the stopping distance for a car traveling at 70 mph?

Answer 1

You are told that

d(v) = kv^2

140 = k*2500
k = 0.056

so,
d(30) = .056*900
d(70) = .056*4900

Answer 2

THANK YOU!

Answer 3

350