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. velocity A V B D C (a) 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 time (b) At point C, which of the following describes the motion of the cork? O the cork is moving upward the cork is moving downward O the cork is not moving UC (c) At which point(s), if any, is the acceleration zero? (Select all that apply.) A B none of these

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