Mount N Blade Cd-key Physics One Question, Need To Find K, I Can Set Up Equations And Solve Part But Need K.?

Physics one question, need to find k, i can set up equations and solve part but need k.? - mount n blade cd-key

I'm in the middle of what I need to know the equations, heres the problem

A vibration sensor used in the tests of a washing machine consists of an aluminum cube 1,50 cm (on board on a piece of leaf spring steel as a blade) is mounted such that in a vertical plane. The bulk of the volume is small compared with the dice, but the length of the strip is large relative to the size of the cube. The other end of the belt is anchored in the machine does not work. A horizontal force of 1.40 N are needed in the bucket application, by 2.65 cm in from the equilibrium position. Solve the cube, what is the frequency of vibration? (Hz)

so that their number depends only vertically, but it is a little off-centered, I need the angular frequency, I think it is the third root of K / m. SI kx =-. If I could Ki is the angular frequency can be found, then at the time of plug and use it to find the frequency. It is important to vertical?