Spaceship 1 and Spaceship 2 have equal masses of 300 kg Spaceship 1 has an initial momentum magnitude of 600 kg-mSpaceship 1 and Spaceship 2 have equal masses of 300 kg Spaceship 1 has an initial mome?

Both spaceships have the same mass and spaceship 1 has an initial momentum magnitude of 600 kg-m/s. Since momentum is conserved in an isolated system, the final momentum of spaceship 1 will still be 600 kg-m/s after any interaction.