I need the corect answer for letter (C) pls When a 2.40-kg object is hung vertic

Question

I need the corect answer for letter (C) pls

When a 2.40-kg object is hung vertically on a certain light spring described by Hooke?s law, the spring stretches 3.10 cm. (a) What is the force constant of the spring? 774.19 N/m (b) If the 2.40-kg object is removed, how far will the spring stretch if a 1.20-kg block is hung on it? 1.55 cm (C) How much work must an external agent do to stretch the same spring 9.60 cm from its un stretched position? 7.13 Your response differs from the correct answer by more than 100%. J

Explanation / Answer

C) Workdone by external egent on the spring, W = 0.5*k*x^2

= 0.5*774.19*0.096^2

= 3.57 J

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