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An astronaut is floating in outer space. There are no external forces acting on the astronaut....

An astronaut is floating in outer space. There are no external forces acting on the astronaut. The mass of the astronaut plus his/her equipment is 60 kg. The astronaut is at rest with a wrench in their hands. The astronaut then throws the wrench that weights 1 kg at 20 m s-1. The mass of the astronaut is now 59 kg. What is the magnitude of the astronaut's velocity after he/she threw the wrench?

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