A person with a mass of 65 kg goes bungee jumping. At the lowest point, he is located 30 m below his starting point. If, at the equilibrium point, the bungee cord measures 15m, what is its spring constant?
2. Relevant equations
F = k*x
Ep = (1/2)(k)(x^2)
3. The attempt at a solution
At the bottom, all the gravitational potential energy is converted to elastic potential energy.
mgh = (1/2)(k)(x^2)
(60 kg)(9.8 m/s^2)(30 m) = (1/2)(k)(30^2)
k = 39.2 N/m
I am not sure if this is correct, why did they give the equilibrium information? What does that mean?