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Vc91
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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 Equations
T-mgcos(x) = mv^2/r
Mgh initial = mgh final + 1/2mv^2 final
The Attempt at a Solution
I am having trouble figuring out what to put for initial and final heights. For initial height I got rcosx and final is (r-rcosx)? Therefore due to conservation of energy
Mgrcos(x)=(r-rcos(x))mg + 1/2 mv^2. Can someone please let me know if this is correct?