Posted by **Emily** on Sunday, December 2, 2012 at 2:19am.

A 83.5 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 35.5 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 0.599 kg, and the astronaut throws the wrench with a speed of 21.6

m/s.

How long does it take the astronaut to reach

the ship?

Answer in units of s

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