An astronaut in her space suit has a total mass of 87.0 kg, including suit and oxygen tank.  Her tether line loses its attachment to her spacecraft while she’s on a spacewalk.  Initially at rest with respect to her spacecraft, she throws her 12.0 kg oxygen tank away from her spacecraft with a speed of 8.00 m/s to propel herself back toward it.                                                                                                                               a.What is her subsequent velocity after she throws her oxygen tank?                         b.Explain in terms of Newton’s laws of motion why this strategy works?

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