Question
A 2 kg body moving at 6 m/s collides and sticks to a 4 kg body moving at 0 m/s along the same line. What is their common velocity?
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Correct Answer: D. 2 m/s
Explanation:
Total momentum before equals total momentum after.
For sticking bodies, v = (m₁u₁+m₂u₂)/(m₁+m₂).
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