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Logan is standing on a dock holding onto a rope swing that is ?=4.30 m long...

Logan is standing on a dock holding onto a rope swing that is ?=4.30 m long and suspended from a tree branch above. The rope is taut and makes a 30.0° angle with the vertical. Logan swings in a circular arc, passing through the bottom of the arc then releasing the rope when it makes an angle of ?=13.1° with the perpendicular. If Logan's mass is 71.0 kg , how much work ?grav does gravity do on him up to the point where he releases the rope? PLEASE SHOW THE ANSWER AND THE STEPS YOU TOOK TO GET THERE

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