(Answered) A man standing on very slick ice fires a rifle horizontally

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A man standing on very slick ice fires a rifle horizontally. The mass of the man together with the rifle is 70 kg, and the mass of the bullet is 10 g.

If the bullet leaves the muzzle at a speed of 500 m/s, what is the final speed of the man?

Express your answer using two significant figures.

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