posted by Kinga .
A steel ball is hung from a vertical ideal spring where it oscillates in simple harmonic motion with a period T . At time t = 0 s, the ball is at its maximum displacement, A , from its equilibrium position. In terms of the period, at what time will the ball be at y = 0.75 A ? a) 0.33 T b) 0.25 T c) 0.19 T d) 0.15 T e) 0.12 T