A 0.40-kg block is attached to a light, horizontal spring of stiffness 84 N/m; the other end of the spring is attached to a wall; the block is free to oscillate on a frictionless, horizontal surface.
(a) What is the time interval for one complete cycle?
(b) If the block is released from rest when the spring is stretched by 3.0 cm from its relaxed length, how much mechanical energy does the system possess?
(c) What is the maximum speed of the block?