A daredevil plans to bungee jump from a balloon 52.0 m above a carnival midway.

Question

A daredevil plans to bungee jump from a balloon 52.0 m above a carnival midway. He will use auniform elastic cord, tied to a harness around his body, to stophis fall at a point 10.0 m above the ground. Model his body as aparticle and the cord as having negligible mass and obeying Hooke'slaw. In a preliminary test, hanging at rest from a 5.00 m length ofthe cord, he finds that his body weight stretches it by1.70 m. He will drop from rest at thepoint where the top end of a longer section of the cord is attachedto the stationary balloon.
(a) What length of cord should he use?
1

(b) What maximum acceleration will he experience?
2

(a) What length of cord should he use?
1

(b) What maximum acceleration will he experience?
2

Explanation / Answer

find value of k for the cord...   k1 = force / stretch = mg/s    where   s = 1.70

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