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Q.

A particle experiences a perfectly elastic collision with a stationary particle. Then the ratio of their masses , if after this head on collision the particles by apart in opposite directions with equal velocities  is   1 : X, then  X =

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answer is 3.

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Detailed Solution

Given u2=0  and V1=−V2    (m1−m2m1+m2)u1=-2m1u1m1+m2⇒3m1=m2   ⇒m1m2=13
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