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

A body of mass `m_(1)` collides elastically and head on with another of mass `m_(2)` at rest. If initial velocity of `m_(1)` is `u_(1)` and final velocity after the collision is `(u_(1))/(1.5)`. What is the ratio of `(m_(1))/(m_(2))`?

A

`1:25`

B

`1:5`

C

`5:1`

D

`25:1`

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