A bungee cord is 450m long when un-streched a 170m tall, Ask an Expert

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A bungee cord is 45.0m long when un-streched. A 1.70m tall jumper (mass 70kg), with both feet tied to the cord, falls from a bridge 85m above the river. If the jumpers head just touch the water at the lowest point.

1) What is the force k of the bungee cord

2) what is the speed of the jumper when he/she is 55.0m below the bridge?

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