1. The problem statement, all variables and given/known data Tarzan plans to cross a gorge by swinging in an arc from a hanging vine, as shown in the figure. If his arms are capable of exerting a force of 1200 N on the vine, what is the maximum speed he can tolerate at the lowest point of his swing? His mass is 100 kg, and the vine is 4.5 m long. 2. Relevant equations Tension force - mg = ma (a * r)^1/2 = v 3. The attempt at a solution 1400 N = (100 kg)(a)+(100 kg)(9.8m/s^2) 420 N = 100kg * a a = 4.20 m/s^2 (4.20 m/s^2)(2.25m)^1/2 = v Why is it incorrect to use 2.25 m as the radius? They gave the entire length of the vine.