A 0.40kg puck slides without friction on a level air track and is attached to a horizontal ideal spring with spring constant 30N/m that is fixed at one end. At t=0 the puck is held 0.15m to the right of the equilibrium position and released from rest.
(a) Determine the magnitude and direction of the puck’s acceleration the instant it is released.
(b) After some time the puck is observed to be 0.050m to the left of equilibrium while moving leftward. Calculate the magnitude and direction of the acceleration at that instant.