Suppose stretched spring is used to supply power to light bulb

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Suppose stretched spring is used to supply power to light bulb. The spring has spring constant k=46.7 N/m and is stretched from its equilibrium length (legth where spring force is zero) by length 2.72 m. If the spring returns to its equilibrium length in 68.6 seconds, what is the average power in Watts that could be transferred from spring to light bulb?

(Answer in positive quantity)