Question: An astronaut initially at rest whose mass is 81 kg carries an empty oxygen tank with a mass of 7 kg. She throws the tank

An astronaut initially at rest whose mass is 81 kg carries an empty oxygen tank with a mass of 7 kg. She throws the tank away from herself with a speed of 36 m/s which causes her to recoil the opposite direction. With what speed in m/s does she start to move off into space

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