Would it be rcosx-r then? I'm just not sure how to find the appropriate height since the problem says that the height from the top of the cliff to the bottom of the swing is 3.2 m but I know that you are not supposed to just simply plug in 3.2 m for h in the conservation of energy equation.
Homework Statement
Tarzan who weighs 688 N swings from a cliff at the end of a vine 18 m long. From the top of the cliff to the bottom of the swing he descends by 3.2 m. The vine will break if the force exceeds 700 N. Find the angle with the vertical at which the vine breaks.
Homework...