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In a 1-D elastic collision between two pucks on a frictionless air-hockey table, the pre-collision velocity of puck A is v to the right, and the velocity of puck B is 4v to the left (define left as positive). The mass of puck B is two times the mass of puck A. What is the velocity of each puck after collision? Use v=1.2 m/s for calculations.

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