If an object on a horizontal frictionless surface is attached to a spring, displaced, and then released, it oscillates. suppose it is displaced 0.125 m from its equilibrium position and released with zero initial speed. after 0.860 s, its displacement is found to be 0.125 m on the opposite side and it has passed the equilibrium position once during this interval. find the amplitude of the motion.= the period of the motion.= the frequency of the motion.=