A 3.0-kg object moving in the positive x direction has a one-dimensional elastic collision with a 5.0-kg object initially at rest. After the collision the 5.0-kg object has a velocity of 6.0 m/s in the positive x direction. What was the initial speed of the 3.0 kg object?
A. 6.0 m/s
B. 7.0 m/s
C. 4.5 m/s
D. 8.0 m/s
E. 5.5 m/s
Answer: D
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