A trampoline spring has a spring constant $k = 1000\text{ N/m}$. How much work is done to stretch the spring from an initial extension of $e_1 = 0.10\text{ m}$ to a final extension of $e_2 = 0.30\text{ m}$?

• A$10\text{ J}$
• B$40\text{ J}$
• C$45\text{ J}$
• D$50\text{ J}$

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