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Energy stored problem

 
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Oct17-04, 08:10 PM   #1
 
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Energy stored problem

Im really stuck with this question, hoping someone could give me a hand

A bungee rope of unstretched length 50M is designed to allow a 70Kg man to come to rest 85m below the platform from which he jumps.

Calculate the energy stored in the rope when the man has come to rest. Ignore the weight of the rope.
(Gravitational field strength 9.8)


Calculate the gravitational potential energy lost by the man when he comes to rest.


Am i right to do
70 x 9.8 = 686N
Work Done = Force x Displacement
=24.1Kj?

Im not sure if im using the correct formula, and im totally stuck on the 2nd part
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Oct17-04, 11:40 PM   #2
 
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Quote by Rampage


Am i right to do
70 x 9.8 = 686N
Yes, that's right so far

Work Done = Force x Displacement
=24.1Kj?
The displacement is wrong

Im not sure if im using the correct formula, and im totally stuck on the 2nd part
The second part is the key to the problem.

Try reading

http://id.mind.net/~zona/mstm/physic...ialEnergy.html
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