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A carrom coin elastically collides head-on with another identical coin at rest. After collision:
AThe first coin stops, the second moves with the incoming speed
BBoth coins move forward with half the incoming speed each
CBoth coins stop on the board, KE going to friction only
DThe first coin keeps moving, the second stays still on the board
Answer & Solution
Correct answer: A. The first coin stops, the second moves with the incoming speed
For equal masses in 1-D elastic collision, the velocities are exchanged; the incoming coin stops, the struck coin takes its speed.
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