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let the friend drive the birth giving lady to the hospital, then drive to his job interview, and you stay with the love of your life! lol but you are still stuck in the middle of nowhere though... at least you've got some good company

Use conservation of energy (which you can use, because only gravity and the cord perform work): the energy in the top of the tower is equal to the energy in the maximum stretch point. I'd say a likely actual value for a bungy cord would be a few hundreds of N/m.