Physical modelling 1?

A simple harmonic oscillator consists of a block of mass 1.60 kg attached to a spring of spring constant 350 N/m. When t = 2.20 s, the position and velocity of the block are x = 0.171 m and v = 3.880 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?