I am trying to revise this subject but I am unsure which of the two method's I've used is the correct one. Can someone help me? 1. The problem statement, all variables and given/known data two trucks travel towards each other. truck A has a velocity of 10 m/s and truck B has a velocity of 3 m/s. Truck A has a mass of 1000 kg and truck B has a mss of 1500 kg. Find the velocity of B after the collision if A has a velocity of 1 m/s afterwards in the same direction has before the collision. 2. relevant equations total momentum before collision = total momentum after collision p = mv 3. The attempt at a solution method 1 total momentum = (1000 * 10) + (1500 * 3) = 14500 kg m/s momentum of A after collision = 1000 * 1 = 1000 kg m/s momentum of B after collision = 14500 - 1000 = 13500 kg m/s velocity of B: v = p/m v = 13500 / 1500 = 9 m/s method 2 1 = (1000 * 10) - 1500v 1500v = 1000 * 10 v = 1000 *10 / 1500 = 6.6 m/s Thanks.