3. Two balls collide in a perfectly elastic collision. Ball 1 has mass 4.0 kg and is initially travelling at a velocity of 5.5 m/s [ right]. It collides head-on with stationary ball 2 with mass 6.0 kg. Determine the final velocities of both balls by using the formulas on the bottom of the page. No shortcut formulas for full marks! /8 marks)