Position vs time graphs show distance from observer. Velocity vs time graphs show speed relative to observer. Acceleration vs time graphs show speed change relative to observer
Instantaneous velocity is the speed of a moving object at a given point in time. It is measured in m/s and has no direction. Instantaneous velocity equals instantaneous speed without direction. Uniform velocity may have same instantaneous and standard velocity
Relative motion explains how object's movement appears differently from observer's perspective. Motion is always measured relative to specific reference frame, usually Earth. Objects can move in same or opposite directions with reference to each other