Maximum displacement is at the peak and at the valley floor +- 14 cm I suppose maximum would be + 14 cm
1.5 to 4.5 is one cycle as described = 3 sec
Period = 3 sec Freq = 1/per = 1/3 hz Indicates the number of cycles per second
From 6 to 7.5 the weight is moving up from resting position to its peak.....then it begins moving downward back to the resting position at t = 7.5