A simple harmonic oscillator is made up of a mass-spring system, with mass of 1.13 kg and a spring constant k = 180 N/m. At time t=1.88 s, the position and velocity of the block are x = 0.129 m and v = 3.42 m/s. What is the amplitude, Xm, of the oscillations? m What is the velocity of the oscillation at t=0? Be sure to include the minus sign for negative velocity U = m/s