5.
The two pulley arrangements shown in fig 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 of 2mg. The ratio of accelerations
in two cases will be 1 :n. Find n.
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