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Potential Energy

AP Physics 1· difficulty 3/5

Two identical springs, each kk, are arranged in parallel and stretched by the same xx. Total stored elastic PE is

  • A

    2kx22 k x^2

  • B

    12kx2\tfrac{1}{2}k x^2

  • C

    kx2k x^2

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  • D

    14kx2\tfrac{1}{4} k x^2

Explanation

Each spring stores 12kx2\tfrac{1}{2}k x^2, two springs: 2⋅12kx2=kx22 \cdot \tfrac{1}{2}k x^2 = k x^2.

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