A 156 g object is attached to a spring and oscillates on a horizontal air track. The object is stretched a distance 15 cm and released. The sensor measured a maximum speed of 3.84 m/s.

C) At t = 0, the object is moving at 1/3vmax towards the equilibrium with the spring compressed. Using (t) = A cos(wt + do), write a complete expression to describe the motion of the object