Home Physics Work, Energy, Power and Collision Mix Two identical spheres move in opposite direc…
Physics Work, Energy, Power and Collision Mix MCQ (Single Correct)

Two identical spheres move in opposite directions with speeds v 1 and v 2 and pass behind an opaque screen, where they may either cross without touching (event 1) or make an elastic head-on collision (event 2) -

A
We can never make out which event has occurred
B
We cannot make out which event has occurred only if v 1 = v 2
C
We can always make out which event has occurred
D
We can make out which event has occurred only if v 1 = v 2

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Verified by Experts
The correct answer is:
A

Balls are identical and velocity exchanges if elastic head on collision occurs.

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