Oscillations and waves?

A simple harmonic oscillator consists of a block of mass 1.00 kg attached to a spring of spring constant 230 N/m. When t = 1.40 s, the position and velocity of the block are x = 0.199 m and v = 4.100 m/s. (a) What is the amplitude of the oscillations? What were the (b) position and (c) velocity of the block at t = 0 s?