On a Graph That Shows Position on the Vertical Axis

Multiple Choice

On a graph that shows position on the vertical axis and time on the horizontal axis, a parabolic curve that opens downward represents

A) a motion with constant positive acceleration.
B) a motion with constant negative acceleration.
C) a motion with no acceleration.
D) a motion with a positive acceleration followed by a motion with negative acceleration.
E) a motion with negative acceleration followed by a motion with positive acceleration.