A sandbag is motionless in outer space. A second sandbag with three times the mass moving at 12 m/s collides with it. They both stick together, and move at a speed of
A) 3 m/s.
B) 4 m/s.
C) 6 m/s.
D) 8 m/s.
E) none of the above
Correct Answer:
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