1. The problem statement, all variables and given/known data The question ask for the spring constant if the mass is 2 kg and the Natural Friction is 5 Hz. 2. Relevant equations 3. The attempt at a solution I have tried many different things but nothing other than putting in random spring constants into the 1/2pi*sqrt of (k/m). This came out to 1,974 N/m. I need a formula to get this awnser without guessing though.