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 D.

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Detailed Solution

from conservation of momentumm1u1=m2u2=m1v1v1=v2=v m1u1=vm2−m1 e=1=v2−v1u1−u2 V→2−v→1=u1→ v2+v1=u1 2v=u1 m12v=vm2−m1 2m1=m2−m1 3m1=m2 m1m2=13

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