A mass m1 = 6.20 kg is moving North with a velocity of v1 = 13.5 m/s when it collides perpendicularly with another mass m2 = 4.40 kg moving East with a velocity of v2 = 8.80 m/s. Mass m1 runs into mass m2 in an inelastic collision and both masses stick together and move off after the collision at an angle θ = 56.3˚. What will be the velocity of these two masses after the collision? How much kinetic energy was lost in this inelastic collision? My work so far: P initial: 1: x - 0 y - 6.2(13.5) = 83.7 2: x - 4.4(8.8) = 38.72 y - 0 P final: 1 & 2: x - 10.6(Vfcos56.3) = 5.9Vf y - 10.6(Vfsin56.3) = 8.8Vf I don't know what to do next..... Also for the kinetic energy what would I do? Thanks!