Speed, distance & stopping distance

You are driving at 80 km/h on the road between Nijverdal and Wierden. You see that the car ahead has to brake hard. How long is your stopping distance, from the moment you see it until you stand still?

Explanation

False — you calculate the braking distance without dividing by 2. Braking distance = (speed : 10) x (speed : 10) : 2, so at 80 km/h (8 x 8) : 2 = 32 m, not 64 m. Adding about 22 m of reaction distance, the stopping distance is 54 m (Book p.126).