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A spring of spring constant 5×10^3N/m is stretched initially by 5cm from the unstretched position. Then the work done to stretch is further by another 5cm is?

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A spring of spring constant 5×10^3N/m is stretched initially by 5cm from the unstretched position. Then the work done to stretch is further by another 5cm is?

(a) 6.25Nm

(b) 12.50Nm

(c) 18.75Nm

(d) 25Nm

This question was addressed to me during an interview for a job.

This question is from Oscillatory Motion in chapter Oscillations of Engineering Physics I

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The correct answer is (c) 18.75Nm

Explanation: W=1/2×k((x2)^2-(x1)^2)

W=1/2×5×10^3×(0.10^2-0.05^2)

W=18.75J.

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