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If m(1) collides another mass body m(2) ...

If `m_(1)` collides another mass body `m_(2)` elastically, then what will be the fraction of kinetic energy retained by the body of mass `m_(1)`.

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The fraction of energy retained by `m_(1)=(4m_(1)m_(2))/((m_(1)+m_(2))^(2))`
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