Question
A 3 kg object moving at 4 m/s sticks to a 1 kg object moving in the same direction at 2 m/s. What is the final velocity?
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Correct Answer: B. 3.5 m/s
Explanation:
Total momentum is 3×4+1×2=14 kg·m/s.
Total mass is 4 kg, so v=3.5 m/s.
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