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## Homework Statement

An 89 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 the earth and several seconds later is 43.8m behind the ship, at rest to 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 wrenches mass is .690 kg, and the astronaut throws the wrench with a speed of 21.9 m/s.

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

## Homework Equations

mv1 = mv2

## The Attempt at a Solution

i tryed (.690)(21.9) = (89)(x) and got the velocity of the astronaut .17 m/s so i multiplied that by the distance 43.8m and got 7.43 s is this correct ??