Figure 14.2. shows the circular motion of a particle. The radius of the circle, the period, sense of revolution and the initial position are indicated on the figure. The simple harmonic motion of the x-projection of the radius vector of the rotating particle P is

(a) x (t) = B sin (2πt/30).

(b) x(t) = B cos (πt/15)

(c) c(t) = B sin (πt/15 + π/2)

(d) c(t) = B cos (πt/15 + π/2)