Two balls undergo a perfectly elastic head-on collision, with one ball (m2 = 80.0 g) initially at rest at the edge of a table. The incoming ball m1 = 40.0 g has a speed of 20 m/s.
a) Find the final velocity of ball with mass m1 = 40.0 g. In what direction does the ball move after collision?
b) Find the final velocity of the second ball with mass m2. In what direction does the ball move after collision?
Please show work