posted by Elizabeth .
An 85.4 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 22.4 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. If the wrench has a mass of 0.370 kg, and the astronaut throws the wrench with a speed of 16.0 m/s, how long does it take the astronaut to reach the ship?