Can someone explain this: For question A I originally got around .142 M, but that was apparently wrong, because I assumed the phase constant was zero. Can someone explain what the phase constant is and how to find it? A simple harmonic oscillator consists of a block of mass 2.60 kg attached to a spring of spring constant 180 N/m. When t = 3.00 s, the position and velocity of the block are x = 0.129 m and v = 3.415 m/s. (a) What is the amplitude of the oscillations? (b) What was the position of the mass at t = 0 s? (c) What was the velocity of the mass at t = 0 s?