A buoy floating in the sea is bobbing in simple harmonic

Last updated: 8/2/2022

A buoy floating in the sea is bobbing in simple harmonic motion with period 2 seconds and amplitude 8 in. Its displacement d from sea level at time 1-0 seconds is 0 in, and initially it moves upward. (Note that upward is the positive direction.) Give the equation modeling the displacement d as a function of time t