### Simple harmonic motion: Position velocity and period

A raft is bobbing up and down in a lake. Its vertical position x above the flat surface of the water is given by x=0.60sin(3.0t+4.2), where distances are in metres and time t is in seconds. 1. What is the boat's position at t=0? At t=2.8s? 2. What is the period of the raft's oscillation? 3. What is the boat's maximum sp