A 130.0 kg mail bag hangs by a vertical rope 4.00 m long. A bored (but very strong) postal worker then displaces the bag to a position which is horizontally 2.00 m away from the original vertical line of the rope. During the displacement, the postal worker always keeps the rope taut so that the bag actually moves in an arc, and experiences a vertical displacement in addition to the given horizontal displacement. 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 by the rope? C) As the bag is moved to this position, how much work is done by gravity? D) As the bag is moved to this position, how much work is done by the worker