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An astronaut is motionless in outer space. Upon command, the propulsion unit strapped to her back ejects gas with a velocity of 18 m/s [up]

An astronaut is motionless in outer space. Upon command, the propulsion unit strapped to her back ejects gas with a velocity of 18 m/s [up] causing the astronaut to recoil with a velocity of 0.45 m/s [down]. After the gas is ejected, the astronaut has a mass of 156 kg. What is the mass of the ejected gas?

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