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    Simple Harmonic Motion.

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    I have to find the mass of an object. The problem is that my result is a negative one.

    The problem is as follows:
    A teacher demonstrates a harmonic motion with an object of mass m0, hung on a wire with constant k. A mass of 1,25g is added to the object, which results in a loss of 2.5% of the original frequency.
    What is the (original) mass of this object?

    I tried, but I got -0.025 Kg.

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    https://brainmass.com/physics/classical-mechanics/simple-harmonic-motion-40901

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    The frequency of simple harmonic motion like a mass on a spring is determined by the mass m and the stiffness of the ...

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