A particle of mass moving at collides with a particle of mass at rest. They coalesce. Find their common speed.
Answer and explanation
Correct answer: A.
- Step 1: Momentum is conserved: .
- Step 2: , so m s.
Answer
.
Why not the others: is what you get if you ignore the second particle's mass. is what you get if you divide by the second mass only. is what you get if you add the speeds.
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