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Energy stored in a spring when its extension changes (U proportional to x squared)

This type of question, asked 2 times: 9 May 2023 S1, 19 Apr 2026 S1. All 2 questions below, oldest first.

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  1. Question 1

    9 May 2023 S1

    16
    The potential energy of a long spring when it is stretched by 3 cm is UU. If the spring is stretched by 9 cm, potential energy stored in it will be

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  2. Question 2

    19 Apr 2026 S1

    105
    The spring is initially in unstretched condition. It is first stretched by a length 'xx' and the work done is W1W_1. Then again it is stretched by further length 'xx' when the work done is W2W_2. The value of W2W_2 is given by

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