If the initial velocity is 10 m/s the braking distance is 5 m. What is the braking distance with an initial velocity of 90 km/h?
v = 90 km/h = (90/3.6) m/s = 25 m/s
n = 25/10 = 2.5
n2 = 2.52 = 6.25
braking distance = n2 x old braking distance
braking distance = 6.25 x 5
braking distance = 31.25 m