The vertical velocity of a cork bobbing up and down on the waves in the sea is shown below. In this graph, upward is considered positive.

Sketch a graph of the height of the cork above the sea floor as a function of time, and use that to select the correct answers to complete the following statements.

At point A, the cork is ? at its highest point at its lowest point at the midline of its motion , ? moving upwards moving downwards moving neither upwards nor downwards .

At point B, the cork is ? at its highest point at its lowest point at the midline of its motion , ? moving upwards moving downwards moving neither upwards nor downwards .

At point C, the cork is ? at its highest point at its lowest point at the midline of its motion , ? moving upwards moving downwards moving neither upwards nor downwards .

At point D, the cork is ? at its highest point at its lowest point at the midline of its motion , ? moving upwards moving downwards moving neither upwards nor downwards .