A block of mass m = 12 kg is clamped between two blocks (Fig. ). The coefficient of friction between the pads and the load is f = 0.3. At what minimum forces F, pressing the blocks to the load, will the load not slide down? If each of the pressing forces F = 50 N, then what additional vertical force Fadd is required to keep the load at rest? What force Ft is required to pull the load evenly upward?

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