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• CP A 120-kg mail bag hangs by a vertical rope 3.5 m long.
A postal worker then displaces the bag to a position 2.0 m side-
ways from its original position, always keeping the rope taut.
(a) What horizontal force is necessary to hold the bag in the new
position? (b) As the bag is moved to this position, how much work
is done (i) by the rope and (ii) by the worker?

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