A blue train of mass 50 kg moves at 4 m/s toward a green train of 30 kg initially at rest. The trains collide. After the collision the green train moves with a speed of 3 m/s. What is the final momentum of the blue and green train combined?
A. 90 kgm/s
B. 110 kgm/s
C. 50 kgm/s
D. 200 kgm/s
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