A 53.1 kg astronaut on a spacewalk is floating 34.9 m away from the spaceship when the tether breaks leaving the astronaut

Question

A 53.1 kg astronaut on a spacewalk is floating 34.9 m away from the spaceship when the tether breaks leaving the astronaut stranded. Luckily the astronaut has a 14.9 kg oxygen tank that they can throw away from the ship to gain momentum in the opposite direction. If the astronaut throws the oxygen tank with a speed of 1.0m/s away from the spaceship, how long does it take the astronaut to make it to the spaceship?

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