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    Work kinetic energy

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    Please see the attachments.
    Power= mom*ang vel. Please use work kinetic energy concepts.

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    Solution Preview

    By energy law,
    Initial mechanical energy = final mechanical energy
    Initial energy
    = potential enrgy of spring (PESi)
    + gravitational potential energy of rod (PERi) (reference is B)

    Final energy
    = potential energy of spring(PESf)
    + rotational kinetic energy of rod (RKERf)

    Because, natural length of spring,
    lo = 225 mm
    initial length of spring,
    li = ...

    Solution Summary

    This solution uses energy law to find angular velocity. It's provided in 590 words and includes an attached .jpg image to enhance understanding.