a $13\mathrm{.}1$ kg object on a horizontal frictionless surface is attached to a spring with k $=1030$ N$/$m$.$ the object is displaced from equilibrium $41\mathrm{.}9$ cm horizontally and given an initial velocity of $13\mathrm{.}3$ 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, $($d$)$ the motion's amplitude?