A simple harmonic oscillator consists of a block of mass 1.30 kg attached to a spring of spring constant 420 N/m. When t = 0.560 s, the position and velocity of the block are x = 0.198 m and v = 4.040 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?