(Answered) In order to heal properly from a fractured thigh a patients

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In order to heal properly from a fractured thigh a patient's leg must be kept under traction. In the system shown below the leg a kept under traction by a series of ropes and pulleys attached to a weight W. If the physical therapist specifies that the traction force directed along the leg must be 29N, what should the attached weight W be?

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