An orangutan in a tree sights some tasty frult in another tree. It grabs the end of a vine with length 20 m that makes an angle of 45° with the vertical, steps off the tree limb, and swings down and then up to the other tree. Upon arrival at the other tree, the vine makes an angle of 30° with the vertical.
Ignoring alr resistance and the mass of the vine, calculate the orangutan's speed just before it reached the target tree.
4.3 m/s
6.5 m/s
7.9 m/s
2.88 m/s