A 70.5kg football player is gliding across very smooth ice at 1.75 m/s. He throws a 0.460 kg football straight forward.

PART A: What is the player's speed afterward if the ball is thrown at 12.5m/s relative to the ground?

PART B: What is the player's speed afterward if the ball is thrown at 12.5m/s relative to the player?

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