Relative velocity refers to the velocity of an object as observed from another moving object or reference frame.
Topic 1.1: 1.1 Position, Velocity, and Acceleration
Relative Velocity cheat sheet for homework
A frame of reference is a coordinate system used to describe positions and motions relative to other objects or observers.
Speed is how fast an object moves without considering its direction.
Acceleration is the rate at which an object's velocity changes over time.