A block of mass m on a smooth horizontal...

A block of mass m on a smooth horizontal surface is. Connected to a second mass 2m by a light cord over a light frictionless pulley as shown. ( Neglect the mass of the cord and of the pulley). A force of magnitude `F_(0)` is applied to mass m as shown. Neglect any fiction . Find the value of force `F_(0)` for which the system will be in equilibrium

2mg

3 mg

4mg

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