Spiderman, whose mass is 80.0 kg, is dangling on the free end of a 8.7-m-long webline, the other end of which is fixed to a flagpole above. By repeatedly bending at the waist, he is able to get himself in motion, eventually swinging enough that he can reach a ledge when the webline makes a 27.6° with the vertical. How much work was done by the gravitational force on Spiderman in this maneuver?
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