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Simple Harmonic Motion.

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.

Solution Summary

The solution is provided in an attachment with a diagram and a step-by-step completed equation.

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