A 3.0-kg object moving 8.0 m/s in the positive x direction has a one-dimensional elastic collision with an object (mass = M) initially at rest. After the collision the object of unknown mass has a velocity of 6.0 m/s in the positive x direction. What is M?
A. 7.5 kg
B. 5.0 kg
C. 6.0 kg
D. 4.2 kg
E. 8.0 kg
Answer: B
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