1. The problem statement, all variables and given/known data A 0.0600 kg tennis ball, moving with a speed of 2.50 m/s, has a head-on collision with a 0.0900 kg ball initially moving away from it at a speed of 1.00 m/s. Assuming a perfectly elastic collision, what is the speed and direction of each ball after the collision? 2. Relevant equations m1v1+m2v2 = m1v1'+m2v2' 3. The attempt at a solution with the given, I know that m1= .06 kg m2=.09 kg v1= 2.5 m/s v2= 1.0 m/s after this, I don't know where to start?