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A 80 kg student jumps off a bridge with a 10-m-long bungee cord tied to his...

A 80 kg student jumps off a bridge with a 10-m-long bungee cord tied to his feet. The massless bungee cord has a spring constant of 420 N/m. You can assume that the bungee cord exerts no force until it begins to stretch. How far below the bridge is the student's lowest point?

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