1. The problem statement, all variables and given/known data In a road test,a car was uniformly accelerated from rest over a distance of 400m in 18.5s. The driver then applied the brakes, stopping the car in 4.9 s with constant deceleration. a) calculate the acceleration of the car for the first 400m. b)Calculate the average speed of the car for the journey covering both the acceleration and braking distances. 2. Relevant equations v=d/t avg speed=distance / time 3. The attempt at a solution a)v=d/t v=400/18.5 =21.62ms^-1 b) I have no idea, I don't know what to do. Could someone give me a hint on what values to use or what formula to use. Is my part a right?