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**1. Homework Statement**

I've had some problems trying to work through this problem:

Two springs of stiffness k1 and k2 are attached in succession to a mass m. What is the frequency of vibrations in terms of the spring stiffness k1 and k2 and the mass m?

**2. Homework Equations**

f=(1/2pi)sqrt(k/m)

I think that is the only relevant equation, but I am not entirely sure.

**3. The Attempt at a Solution**

I am confused at weather or not I need to multiply or add the two spring constants. Or, if I need to make two separate equations with the frequencies being constant in both equations.

I tried to relate it to the energy of a spring, but I didn't have a displacement so that equation would not work.

Any help would be greatly appreciated, Thanks!