What is speed
As speed we call the fast quality. In physics, it refers to the relationship between the distance traveled by a body and the time taken to cover it. As such, it is a scalar physical quantity, and can be measured in kilometers, miles or knots per hour.
Although speed is usually used as a synonym for speed in everyday language, they are not always exact synonyms, since speed, which is a vector magnitude, considers the direction or course in which a body or object moves, given that speed , which is a scalar magnitude, does not take into account.
Speed in physics
Speed is a scalar magnitude that determines the relationship between the distance traveled by a body or object and the time it takes to cover said distance. In this sense, it uses dimensions of length and time that can be, depending on the case, kilometers per hour (k/h) or meters per second (m/s). Unlike speed, it is not a vector magnitude, but rather represents precisely the magnitude of celerity.
Medium speed
The average speed is calculated by taking the distance traveled by a body and the time taken to travel it. For example: a person who takes two hours to travel 60 kilometers will be moving with an average speed of 30 kilometers per hour.
Instant speed
The instantaneous speed is that which is measured at a given instant of the displacement of a body at a given point. It can be measured with a speedometer.
Constant speed
Constant speed is the speed at which a body moves without registering variations in its speed, but rather maintaining the same speed at all times.