Spaceship 1 and spaceship 2 have equal masses of 200 kg. they collide.
spaceship 1's final speed is 2 m/s, and spaceship 2's final speed is 1 m/s in
the same direction. what is their combined momentum?
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a. 200 kg-m/s
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o
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b. 400 kg-m/s
c. 800 kg-m/s
d. 600 kg-m/s