The pulley arrangements shown in the figure are identical, the mass of the rope being negligible. In case (a) mass m is lifted by attaching a mass of $$2$$ m to the other end of the rope. In case (b) the mass m is lifted by pulling the other end of the rope with a constant downward force F $$=$$ $$2$$ mg, where g is the acceleration due to gravity. The acceleration of mass m in case (a) is :

Question

Infinity Learn · Accepted Answer

Case (a):$$a1=2mg$$−$$mg3m=g3$$ Case (b):$$a2=2mg$$−$$mgm=g$$

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