Question 1171810
The initial position is the maximum displacement of -2 cm, since the positive
direction is up. The object oscillates back and forth between d = -2 
and d = 2 cm. Since the period is 6 s, the angular velocity, 
w = 2*pi/T = pi/3. 
Thus, the distance d is described by: d(t) = -2cos(wt) = -2cos(pi/3*t)
The graph is shown below:
*[illustration oscillate.png]