The vertical velocity of a cork bobbing up and down on the waves in the sea is given by the figure below. Upward is considered positive. At point A, which of the following describes the motion of the cork ? O the cork is moving upward O the cork is moving downward O the cork is not moving At point B, which of the following describes the motion of the cork ?O the cork is moving upward O the cork is moving downward O the cork is not moving At point C, which of the following describes the motion of the cork ? O the cork is moving upward O the cork is moving downward O the cork is not moving At point D, which of the following describes the motion of the cork ? O the cork is moving upward O the cork is moving downward O the cork is not moving At which point(s), if any, is the acceleration zero ? (Select all that apply.) O AO BO CO D O none of these
