Harmonic Motion Problem

An oscillator consists of a block attached to a spring( k = 400 N/m). At some time t, the position (measured from the system’s equilibrium location), velocity, and acceleration of the block are x = 0.100m, v = -13.6 m/s, and a = -123 m/s##^2## . Calculate the
A. frequency of oscillation
B. mass of the block
C. amplitude of the motion