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Question

Two particles moving initially in the same direction undergo a one dimensional, elastic collision. Their relative velocities before and after collision are →v1 and →v2. Then :

A
v1=v2
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B
v1=v2 only if the two are of equal mass
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C
v1=v2=v12
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D
v1.v2=v12
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Solution

The correct options are
A v1=v2
C v1=v2=v12
D v1.v2=v12
Because the collision is elastic, option A is correct.
But option B is incorrect as a vector cannot be equated to a scalar.

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