A car is moving at a constant speed of 72km h−1 on a straight road when the driver notices a barricade 40m ahead. He immediately applies the brakes, producing a uniform retardation of 5m s−2.
(i) Determine whether the car stops before reaching the barricade. Show your calculations clearly.
(ii) If the car does not stop in time, calculate the speed with which it collides with the barricade.