1. The problem statement, all variables and given/known data An armoured car with a mass of 5 tonnes is located on a smooth plane which is inclined at an angle of tan-1 (5/12) to the horizontal as shown in Figure Q3. A missile of mass 15kg is fired horizontally from this armoured car at 650m/s. Determine the velocity with which the armoured car will begin to travel up the inclined plane. 2. Relevant equations I think that a momentum equation needs to be used, but im not sure how to apply that equation to a slope. 3. The attempt at a solution The answer to the question is 1.8m/s. The closest I have got to it is 1.9m/s. This is my attempt. 0 = mdv - Mv dv+v = 650m/s mdv = Mv mx(650-v) = Mv 15x(650-v) = 5000v v = (15x650) / (15+5000) v = 1.94 m/s At which point do I taken into consideration the angle of the slope?