A bungee cord that behaves linearly elastically has an unstressed length L0 = 760 mm and a stiffness k = 140 N/m. The cord is attached to two pegs, distance b = 380 mm apart, and pulled at its midpoint by a force P = 80 N (see figure).
(a) How much strain energy U is stored in the cord?
(b) What is the displacement δC of the point where the load is applied?
(c) Compare the strain energy U with the quantity PδC / 2.

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B