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I found part a, but need help with part b: Tarzan plans to cross a gorge...

I found part a, but need help with part b: Tarzan plans to cross a gorge by swinging in an arc from a hanging vine. His mass is 83.58 kg and the vine is 3.01 m long.

a. If his arms are capable of exerting a force of 14001400 N on the rope, what is the maximum speed he can tolerate at the lowest point of his swing? Answer: 4.58 m/s

b. On the other side of the gorge, at the highest point of his swing, the vine makes an angle of θ=40​∘​​ from the vertical. At this point, Tarzan's speed is instantaneously zero (as he transitions from swinging up to swinging back again). What is the tension in the vine at the highest point of his swing?

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