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## Homework Statement

The mass of a spaceship is 10012 kg. The spaceship is at rest. Then one part of the ship with a mass of 1000 kg is ejected and emerges with a speed of 112 m/s. What is the speed of the other part?

## Homework Equations

## The Attempt at a Solution

I tried:

pi=pf

mivi=mfv2

10012 (vi)= 1000 kg * 112 m/s

solved for vi and got 11.19 m/s.

Am I correct? or did i need to assume the other part of the spaceship is 12 kg?[/B]