A 90 kg ice hockey goalie, originally at rest, catches a 0.150 kg hockey puck slapped at him at a velocity of 43.1 m/s. Suppose the goalie and the ice puck have an elastic collision and the puck is reflected back in the direction from which it came. Take the puck's initial moving direction as positive. (a) What is the puck's final velocity (in m/s)
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