A 710kg football player is gliding across very smooth ice, Ask an Expert

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A 71.0kg football player is gliding across very smooth ice at 2.00m/s . He throws a 0.420kgfootball straight forward.

What is the player's speed afterward if the ball is thrown at 18.0m/s relative to the ground?

What is the player's speed afterward if the ball is thrown at 18.0m/s relative to the player?

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