Calculating Spring Constant of Bungee Cord

[HHippo]

Homework Statement

A bungee jumper with a mass of 77.0kg, jumps from a high bridge. He just touches the water in the river below and after reaching this lowest point, he oscillates up and down, hitting the lowest point another 8 times in 48.0 seconds. Calculate the spring constant of the bungee cord.

Homework Equations

F = -kx
T = 2π√(m/k)

The Attempt at a Solution

I thought the period was 6 (48/8) and then used those two equations to solve for k. Got 8.94 but I am not sure if I did it right...

 

[rl.bhat]

Hi HHippo, welcome to PH.
Will you please show your calculations?

 

[RTW69]

You know the period and mass you can solve for the spring constant directly from the period equation. Check your math.

 

[ashishsinghal]

method seems correct show your calculations