1. The problem statement, all variables and given/known data A simple harmonic oscillator has spring constant k = 7.8 N/m, amplitude A = 12 cm, and maximum speed 4.3 m/s. What's the oscillator's speed when it's at x = 5.4 cm? 2. Relevant equations KE_max=1/2*k*A^2 KE=1/2mv^2 ma=-kx v=k/ma 3. The attempt at a solution I used each equation in order to find the K_max, the mass of the oscilator, the acceleration, and then the velocity in that order, but the answer I got was wrong.