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Question

A particle of mass m1 experienced a perfectly elastic collision with a stationary particle of mass m2. What fraction η of the kinetic energy does the striking particle lose, if it recoils at right angles to its original motion direction?

A
η=m1(m1+m2)
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B
η=m12(m1+m2)
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C
η=m2(m1+m2)
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D
η=2m1(m1+m2)
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