Speed is a physical quantity that shows how far a body travels in a certain period of time

The speed of a body is always relative, since the speed of a body is always expressed relative to some other body.

Mechanical motions can be classified into two categories: uniform rectilinear motion and variable motion. In case of uniform straight line movement, the speed of the body does not change. In variable motion, the speed or direction of the body changes.

For non-uniform motion, we can calculate the average speed by dividing the distance traveled by the time taken to move.