A weight on the end of a coiled spring is pulled

Question

10cm
below its resting position. The weight is released at time
=t0
seconds and moves upward, oscillating in simple harmonic motion. It completes one cycle in
3
seconds. (Note that upward is the positive direction.)
Give the equation modeling the displacement
d
as a function of time
t
.

Answer 1

see related questions below

again

Answer 2

d = 8 sin (20 π t)