1. The problem statement, all variables and given/known data If it is eg. two balls, both going to the right before and after an elastic shock, how do you determine their velocities after the collision? (speeds before and weights are given) Eg. M = 50 kg u1 = 20 m / s m = 100 kg v1 = 10 m / s (M, m = mass) (u1, v1 = velocity before the collision) (u2, v2 = velocity after collision) 2. Relevant equations The law of conservation of momentum: m*v1+M*u1= m+M*v2*u2 Momentum before = Momentum after 3. The attempt at a solution m*v1+M*u1= m+M*v2*u2 → 100 * 10 +50 * 20 = 100 +50 * v2 * u2 How do I continue from here?