a moving body with mass m1 collisions another body of mass m2 elastically.After collisions the velocity of first body becomes 2/3 of its initial value . Then the ratio of m1 and m2 is
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consider body whose mass is m2 is on rest intally
using conservation of momentum
m1u1 + m2u2 = m1v1 + m2v2
m1u + 0 = m12u/3 + m2v2
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