1. The problem statement, all variables and given/known data Two balls collide in a perfectly elastic collision. Ball 1 has a mass of 3.5kg and is initially travelling at a velocity of 5.4m/s. It collides head-on with stationary ball 2 with mass 4.8kg. Determine the final velocity of ball 2. Given: m1=3.5kg vi1=5.4m/s m2=4.8kg vi2=0m/s 2. Relevant equations See attached pictures 3. The attempt at a solution See attached pictures . I don't know how to solve the problem beyond what I've already done. I'm stuck.