Tarzan, in one tree, sights Jane in another tree. He grabs the end of a vine with length 20 m that makes an angle of 45 degrees with the vertical, steps off his tree limb, and swings down and then up to Jane's open arms. When he arrives, his vine makes an angle of 30 degrees with the vertical.
Calculate Tarzan's speed just before he reaches Jane. You can ignore air resistance and the mass of the vine.
K_1 + U_1= K_2 + U_2
The Attempt at a Solution
i don't know how to relate the angles with this problem?