1. The problem statement, all variables and given/known data 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. Relevant 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!