A ball of mass m1= .250 kg and velocity v01 = + 5 m/s collides head-on with a ball of mass m2= .800 kg that is initially at rest (v02 = 0 m/s). No external forces act on the balls. If the collision is elastic, what are the velocities of the balls after the collision?

Answer 1

The formulas that you need to use for the final velocities can be found here:
http://hyperphysics.phy-astr.gsu.edu/hbase/elacol2.html

The head-on collision case is in part "c"