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November 21, 2014

November 21, 2014

Posted by **Jane** on Wednesday, June 29, 2011 at 2:46pm.

I made the energy formula:

mgh = 1/2kx^2

where h = height of bridge + half of student = 37.75

and x = height of bridge - length of student - length of bungee (to see how much it stretched) = 9.3m

BUT when I solve for k I don't get the right number, which should be 774 N/m.

- College Physics -
**Josh**, Friday, October 18, 2013 at 5:09pmAll of your math is correct except that h is just 36.7 because the bungee is attached to his feet not halfway up his body. Therefore his potential energy has to be measured to that point. Then you get

mgh=1/2kx^2

k=(2mgh)/x^2

k=(2*93.1*9.8*36.7)/9.3^2 = 774.29 N/m

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