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## Homework Statement

A bungee jumper of mass 64.5 kg (including safety gear) is

standing on a platform 48.0 m above a river. The length of

the unstretched bungee cord is 10.1 m. The force constant

of the cord is 65.5 N/m. The jumper falls from rest and just

touches the water at a speed of zero. The cord acts like an

ideal spring. Use conservation of energy to determine the

jumper’s speed at a height of 12.5 m above the water on

the first fall.

## Homework Equations

Ek=1/2mv^2

Ep=mgh

Ee=1/2kx^2

## The Attempt at a Solution

so i did mgh = 1/2mv^2 + 1/2kx^2 and solve for v but somehow i am not getting the answer 6.3m/s