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**Tarzan swinging on a vine.....PLEASE HELP**

starting from rest at point A, Tarzan (whose mass = 100kg) swings on a 10 m long vine, which initially makes a 60deg angle with with the vertical.

a) how much lower than the starting point A is Tarzan, when he reaches point B, the lowest part of his swing?

i got 1.34

b)how much work has earths gravity done on tarzan between points A and B

i got 4387.80Joules

c) how fast is tarzan moving at point B? neglect friction

> i dont understand how to approach this one

d) what is the tension in the vine when tarzan passes throught point B?

> yeh don't know about this one either

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