A puck of mass m, moving at a speed of v1 collides with an identical mass stationary puck. After the collision, one puck moves off at an angle φ1 with a speed of v1’, and the other puck moves off at an angle φ2 with a speed of v2’. a) What are the speeds v1’ and v2’ if φ1 + φ2 = 90o? Express your answers in terms of  v1 and φ1.   b) Is the collision inelastic or (totally) elastic? Support your answer with a  calculation.

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