Calculate Force Constant for Safe Bungee Jumping: F=700N, x=9m, k=77.77 N/m

[Marc Briancon]

Bungee jumping- The unstretched length of the cord is 25.0m, the student weighs about 700N, and the balloon you start at is 36.0 m above the surface of the river below. Calculate the required force constant of the cord if the student is to stop safely 4.00m above the river.

So would I want to use F=kx, then set k=(F/x)...?

F=700 N
x=9 m
k=77.77 N/m

Is that right?

 

[tiny-tim]

Welcome to PF!

… Calculate the required force constant of the cord if the student is to stop safely 4.00m above the river.

So would I want to use F=kx, then set k=(F/x)...?

F=700 N
x=9 m
k=77.77 N/m

Is that right?

Hi Marc! Welcome to PF!

Isn't that when acceleration is zero?

You want the velocity to be zero.