The minimum distance required to stop a car moving at 34.0 mi/h is 43.0 ft. What is the minimum stopping distance for the same car moving at 60.0 mi/h, assuming the same rate of acceleration?
stopping distance = (initial velocity ^2 / 2 * acceleration )
so distance is proportional to square of initial velocity
for 34mph S = 43 ft
for 60 mph = 43 * (60/34)^2
= 133.91 ft