A 2.99-kg metal ball on a horizontal frictionless surface is attached to an ideal massless spring whose spring constant is 203 N/m. The ball is pulled from its equilibrium position at x = 0.00 m to a displacement x = 0.064 m and is released from rest. The ball then executes simple harmonic motion along the horizontal x-axis. When the displacement is 0.2 cm, what is the frequency of the oscillation (in unit of Hz)?