Particle m1 experiences a perfectly elastic collision with a stationary particle m2. After the collision (head-on) the particles fly apart in opposite directions with equal speeds, then

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m1m2=1

m1m2=3

m1m2=2

m1m2=13

answer is B.

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Detailed Solution

from conservation of momentumm1u1=m2u2=m1v1 v1=v2=vm1u1=vm2−m1e=1=v2−v1u1−u2v2→−v1→=u1→v2+v1=u12v=u1m12v=vm2−m12m1=m2−m13m1=m2m1m2=13

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