Question

Cart A, with a mass of 0.2 kg, travels on a horizontal air track at 3 m/s and hits cart B, which has a mass of 0.4 kg and is initially at rest. After the collision the center of mass of the two cart system has a speed in m/s of:
A) 0 m/s
B) 1.0 m/s
C) 2.3 m/s
D) 2.5 m/s
E) 5.0 m/s

Answer

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