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Force and Tension: Lifting himself using Movable Pulley

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Lifting himself using Movable Pulley. Force, tension in the rope and change in energy,

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See Also This Related BrainMass Solution

A person and cage are suspended from pulley; Find force exerted on rope

A man sitting in a cage is connected to a pulley system of three movable and one fixed pulley in the system shown in ATTACHMENT #1.

He pulls down on a rope as shown, to raise himself and the cage. The man and cage have a total weight of 639 nt. Ignore friction as negligible.

PART a. Find the force he exerts to move upward with constant velocity.

PART b. Find the force he exerts to move upward with acceleration of 1.8 m/sec^2.

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