The graph describes the motion of a ball rebounding from a horizontal surface after being released from a point above it. The quantity on the y-axis is the ball's:

Question

G1 Physics · Accepted Answer

The plotted arches represent the ball's height/displacement above the surface versus time: each flight is a parabola between impacts. Velocity would change sign and acceleration would be nearly constant between impacts. Hence the y-axis is displacement, option A.