A 2.01 kg object on a horizontal frictionless surface is attached to a spring with k = 994 N/m. The object is displaced from equilibrium 55.8 cm horizontally and given an initial velocity of 12.8 m/s back toward the equilibrium position. What are (a) the motion's frequency, (b) the initial potential energy of the block-spring system, (c) the initial kinetic energy, and (d) the motion's amplitude? (a) Number i 7.08 Units Hz (b) Number 155.7 Units (c) Number 164.4 Units (d) Number 0.558 Units m v