Elwin, the bungee clown, swings back and forth like a simple pendulum at the end of a bungee cord. If a student determines the time of one complete swing is 6.9s, how long is the bungee cord when Elwin is swinging from it?

Answer 1

T^2 = 2πL/g
so plug in your numbers to find L

Answer 2

oops
T = 2π√(L/g)
so
(T/2π)^2 = L/g