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An object of mass m(1) collides with ano...

An object of mass `m_(1)` collides with another object of mass `m_2`, which is at rest. After the collision the objects move with equal speed in opposite direction. The ratio of the masses `m_(2) : m_(1)` is

A

`3:1`

B

`2:1`

C

`1:1`

D

`1:2`

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