A 53 kg bungee jumper jumps from a bridge. She is tied to a bungee cord whose unstretched length is 13 m, and falls a total of 39 m. if the spring stiffness constant k of the bungee cord=60 Calculate the maximum acceleration she experiences

For a spring the equation offorce is:

F = kx

You can see that the max force occurs at the max extension of the spring. This force acting on the person must equal her mass times her acceleration (F=ma). So:

ma = kx.

Solve for a.