1. The problem statement, all variables and given/known data 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? 2. Relevant equations 3. 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?