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An object ' m ' of mass 50  kg is lifted by using an arrangement as shown in the figure. If the load due to the weight of the pulley and the resistance due to the friction of the pulley is 2.5  kg_wt, calculate the effort required to lift the object. If M.A A_1 and M. A_2 are the mechanical advantages of the inclined plane and the pulleys, respectively, derive an expression for the resultant mechanical advantage if the friction force between the object and the inclined plane is negligible.

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