An object is suspended from a spring which oscillates up and down. The distance from the highest point to the lowest point is 25 m. The object takes 5 seconds to complete 4 cycles. The object is initially stretched to its lowest point and then released. a) Write an equation that describes the distance (d), in metres from the mean position with respect to the time, t, in seconds. b) When will this object be 3.5 m above the mean position for the first time