A 541-kg ice skater is standing at rest on a frozen lake, Ask an Expert

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A 54.1-kg ice skater is standing at rest on a frozen lake. The friction between his skates and the surface of the ice is negligible. If he throws a 5.8 kg block of ice horizontally with a velocity of +12.0 m/s (relative to the ground), what is the magnitude of his recoil velocity (relative to the ground)?

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