Displacement, acceleration and velocity are all part of kinetics, which describes motion. Kinetics gives the accurate description of an object's position or change in its position. Displacement, which is a vector, refers to the distance between an object's initial point to its final point. Its standard unit is a meter. The rate and direction of an object's motion is shown by velocity. Velocity, which is a vector, has a standard unit of meter per second.
Vector is comprised of direction and magnitude. The term "scalar" merely concerns magnitude. For example, speed is a scalar while velocity is a vector.Learn more about Motion & Mechanics