A hockey puck with a mass of 160 g slides at a speed of 12, Ask an Expert

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A hockey puck with a mass of 160 g slides at a speed of 12 m/s on frictionless ice. The puck runs into a small box with a mass of 850 g that is initially at rest. Assuming that the collision is elastic, what is the speed of the hockey puck after the collision?

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