In the solution, c 1 and c 2 are two constants determined by the initial conditions (specifically, the initial position at time t = 0 is c 1, while the initial velocity is c 2 ω), and the origin is set to be the equilibrium position. Each of these constants carries a physical meaning of the motion: A is the amplitude (maximum displacement from the equilibrium position), ω = 2 πf is the angular frequency, and φ is the initial phase.