1. The problem statement, all variables and given/known data A ball of mass 0.206 kg with a velocity of 1.54 m/s meets a ball of mass 0.291 kg with a velocity of -0.396 m/s in a head-on, elastic collision. (a) Find their velocities after the collision. 1f = m/s 2f = m/s (b) Find the velocity of their center of mass before and after the collision. cm, before = m/s cm, after = m/s 2. Relevant equations conservation of momentum? p=mv, pf=pi+I, KEf=KEi (because its elastic), Vcm=Ʃmivi/Ʃmi 3. The attempt at a solution I have spent hours fiddling around with equations and I can't get anything to result in a correct answer. I am stumped and frustrated. This is past homework and I am just looking for an explanation on how I get from this information to the final answers. Step by step would be much appreciated, especially if you use calculus because I am lost and I am only to derivatives in calc I so far. Thank you for any and all help!