If an object on a horizontal frictionless surface is attached to a spring, displaced, and then released, it will oscillate. If it is displaced a distance $0\mathrm{.}130$ mm from its equilibrium position and released with zero initial speed, then after a time $0\mathrm{.}820$ ss its displacement is found to be a distance $0\mathrm{.}130$ mm on the opposite side, and it has passed the equilibrium position once during this interval. Find the amplitude. Find the period. Find the frequency.