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honors physics

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A 3.2 kg block is hanging stationary from the end of a vertical spring that is attached to the ceiling. The elastic potential energy of this spring/mass sytem is 2.1 J. What is the elastic potential energy of the system when the 3.2 kg block is replaced by a 5.3 kg block?

  • honors physics -

    find k for the initial block.
    Weight= kx when
    2.1J=1/2 kx^2 or

    mg=kx and
    4.2J=kx^2 or
    4.2=mg*x solve for x
    know, knowing x, solve for k.

    replace the mass, find new x.
    PE= 1/2 k (newx)^2

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