Spaceship 1 and Spaceship 2 have equal masses of 300 kg. They collide. Spaceship 1's final speed is 2 m/s, and Spaceship 2's final speed 1 m/s in the same direction. What is their combined momentum?

A. 600 kg-m/s

B. 900 kg-m/s

C. 1,200 kg-m/s

D. 3 m/s

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