A spring with a spring constant $k$ of 100 pounds per foot is loaded with 1-pound weight and brought to equilibrium. It is then stretched an additional 1 inch and released. Find the equation of motion, the amplitude, and the period. Neglect friction.

The displacement $y$, in feet from equilibrium is $y(t) =$
where $t$ is time in seconds since the spring was released, and the initial 1 in. stretch is regarded as a positive displacement.

Amplitude: inch(es)
Period: second(s).