You and your friends find a rope that hangs down 19 m from a high tree branch right at the edge of a wide river. You find that you can run, grab the rope, and swing out over the river. You run at 2.0 m/s and grab the rope, launching yourself out over the river.

How long must you hang on if you want to stay dry?

T= 2π√(L/g)

= 2π√(19/9.8)

= 8.37

= 8.37/2

4.37