A body of mass m(1) collides elastically...

A body of mass `m_(1)` collides elastically with another body of mass `m_(2)` at rest. If the velocity of `m_(1)` after collision is `(2)/(3)` times its initial velocity, the ratio of their masses is `:`

`1:5`

`5:1`

`5:2`

`2:5`

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