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The pulley arrangements of fig (a) and (...

The pulley arrangements of fig (a) and (b) are identical. The mass of the rope is negligible. In (a) the mass m is lifted up by attaching a mass 2 m to the other end of the rope. In (b) m is lifted up by pulling the other end of the rope with a constant downward force F = 2 mg. Which of the following is correct?

A

Acceleration in case (b) is 3 times more than that in case (a)

B

In case (a) acceleration is g,while in case (b) it is 2g

C

In both the case, acceleration is same

D

none of these

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The pulley arrangements of Figs. (a) and (b) are identical. The mass of the rope is negligible. In (a) the mass m is lifted up by attaching a mass 2m to the other end of the rope. In (b), m is lifted up by pulling the other end of the rope with a constant downward force F=2mg . The acceleration of m is the same in both cases

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