1. The problem statement, all variables and given/known data Two balls collide on a frictionless surface. Mass m1 = .4 kg and Mass m2 = .3 kg . The initial velocity of m1 is 3 m/s. While m2 is at rest. After the collision the velocity of m1 is 1.5 m/s, θ1 above the horizontal. While m2 gains an unknown velocity of v2f, θ2 below the horizontal. Find v2f, θ1, and θ2 2. Relevant equations Conservation of kinetic energy Conservation of momentum 3. The attempt at a solution I can find v2f, but I am having trouble with finding the angles.