A young 45 kg ice hockey goalie, originally at rest, deflects a 0.14 kg hockey puck slapped at him at a speed of 34.5 m/s. In this problem, take the original direction of the puck as positive. Suppose the goalie and the hockey puck have an elastic collision and the puck is reflected back in the direction from which it came. What would the final velocity of the puck, in meters per second, be in this case?

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