how much work was done against the force of gravity in this maneuver

Batman, whose mass is 85.7 kg, is holding on to the free end of a 12 m rope, the other end of which is fixed to a tree limb above. He is able to get the rope in motion as only Batman knows how, eventually getting it to swing enough that he can reach a ledge when the rope makes a 77.6 â—¦ angle with the vertical. The acceleration of gravity is 9.8 m/s 2 . How much work was done against the force of gravity in this maneuver? Answer in units of J 

 

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