A system consists of two cubes of mass m...

A system consists of two cubes of mass `m_(1)`, and `m_(2)` respectively connected by a spring of force constant k. force (F) that should be applied to the upper cube for which the lower one just lifts after the force is removed, is

`(m_(1)m_(2))/(m_(1)+m_(2))g`

`(m_(1)+m_(2))g`

`m_(2)g`

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