A car is initially travelling at 30 m/s, which is above the speed limit. The driver sees a speed limit trap ahead and applies the brakes for 5 seconds, causing the car to slow down by 2m/s every second while the brakes are on.

Question

A car is initially travelling at 30 m/s, which is above the speed limit. The driver sees a speed limit trap ahead and applies the brakes for 5 seconds, causing the car to slow down by 2m/s every second while the brakes are on.
–How far does a car travel whilst the brakes are
being applied?

Damon · Answer

a = -2 m/s^2 v = Vi - 2 t v = 30 - 2*5 = 20 at the end so average v = 25 m/s 25*5 = 125 meters