Which of the following best defines velocity?

Velocity is defined as a vector quantity, which means it encompasses both magnitude and direction. This distinction is crucial because, unlike speed, which only indicates how fast an object is moving (the magnitude), velocity provides a complete picture by specifying not only the speed but also the direction in which the object is moving.

For example, if a car is traveling at 60 kilometers per hour to the north, its velocity is clearly defined. This aspect of velocity is essential in physical science, as it allows for an understanding of motion in relation to other objects and forces, enabling predictions about future positions and movements.

In contrast, speed alone does not convey directional information and is therefore limited in its ability to describe motion comprehensively.