An air-hockey puck of mass m floats across the table essentially frictionless on a cushion of air. This puck bumps nearly head-on into a second puck that has 3 times the mass, moving in the opposite direction but with the same speed, vi, as the lighter puck. Immediately after the collision, the first puck is moving at a right angle to its original direction. What is the final speed of this puck? What is the final velocity of the heavier puck? (That means speed and direction...) Answers will contain m and vi and some angle ?