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A 1.25kg hockey puck (puck A) slides across a frictionless sheet of ice and collides with...

A 1.25kg hockey puck (puck A) slides across a frictionless sheet of ice and collides with a puck of unknown mass (puck B) head on. The collision is completely elastic, which means no kinetic enegy is lost in the collision. After the collision, puck A moves in the opposite direction at half of its initial speed. Find the mass of puck B.

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