JEE Main & Advanced Physics Work, Energy, Power & Collision Question Bank Work Done by Variable Force

  • question_answer A spring of force constant 800 N/m has an extension of 5cm. The work done in extending it from 5cm  to 15 cm is           [AIEEE 2002]

    A)             16 J    

    B)             8 J

    C)             32 J    

    D)             24 J

    Correct Answer: B

    Solution :

                    \[W=\frac{1}{2}k(x_{2}^{2}-x_{1}^{2})=\frac{1}{2}\times 800\times ({{15}^{2}}-{{5}^{2}})\times {{10}^{-4}}\]\[=8\,J\]

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