1. The problem statement, all variables and given/known data A 6000 Kg lorry is travelling at 80 km/h on a level road. It is brough to rest with a uniform retardation in 2 minutes. Calculate a) the retarding force and b) the distance travelled during retardation. 2. Relevant equations now I know I've got to change the 80km/h into m/s, which is 80 x 0.2778 = 22.224 m/s. for distance travelled its something like S=ut+1/2*-at2. So if someone could explain how to go about doing that question I would be very greatful.