The motion of a particle executing simple harmonic motion is described by the displacement function, x(t) = A cos `(omegat + phi)`. If the initial (t = 0) position of the particle is 1 cm and its initial velocity is `omega cm//s`, what are its amplitude and initial phase angle ? The angular frequency of the particle is `pi s^-1` s If instead of the cosine function, we choose the sine function to describe the SHM : x= B sin `(omegat+alpha)`, what are the amplitude and initial phase of the particle with the above initial conditions.