Posted by **john** on Saturday, January 8, 2011 at 6:10pm.

A 87.2 kg astronaut is working on the engines of a spaceship that is drifting through space with a constant velocity. The astronaut turns away to look at Earth and several seconds later is 44.2 m behind the ship, at rest relative to the spaceship. The only way to return to the ship without a thruster is to throw a wrench directly away from the ship. The wrench has a mass of 0.411 kg, and the astronaut throws the wrench with a speed of 24.1 m/s.

How long does it take the astronaut to reach the ship?

please show the steps

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