Velocity is such a concept in physics that deals with explaining the displacement a body covers that too in a unit of time or it could be defined as how fast an object will move in a specified direction. The S.I. the unit for average velocity is meters per second and the C.G.S units for the average velocity is taken to be centimeters per second. Moreover, the formula of velocity can be written as:

 [ Velocity= Distance or displacement covered by a body\ total time taken to covers the distance]

Velocity and its related concepts

To understand the concept of velocity better, one should know some terms which are:

• Distance: an object is placed on point A and then it moves to point B. now, the length that this object covers while moving from point A to B is the distance it covers. Therefore the length of that path covered by the body is the distance it covers. S.I. unit is the meter and is a scalar quantity.
• Displacement: again a body moves from point A to B, but in terms of displacement, it is a bit different concept. Displacement is also a distance but the shortest distance that the body covers to reach the same B point. The S.I. unit is the meter and it is a vector quantity.
•  Speed: Speed is the ability of a body to move fast. It is defined as the distance a body will cover per unit of time. S.I. unit is a kilometer per second. It is a scalar quantity.
• Velocity: Velocity is basically a quantity that measures the displacement a body will make per unit of time. The S.I. unit is the same as speed which is a kilometer per second but velocity is a vector quantity.
• Acceleration: acceleration is the term used to define the velocity with which the body moves per unit of time. S.I. unit is a meter per second square.

Velocity is the term used most often in physics and applies to almost every concept. Therefore it becomes important to study and understand it. Velocity is a different concept than speed but velocity can also define speed because it also defines the direction as well as the magnitude of the object moving. This velocity term is divided into many types which are:

• Uniform Velocity: when the velocity of a body is such that it covers equal distance in an equal time interval then, that velocity is called Uniform Velocity.
• Variable velocity: variable velocity deals with the velocity which occurs when either magnitude or direction changes or says varies.
• Instantaneous velocity:instantaneous velocity is the type of velocity which can be defined as the rate of change of the position of the body to the particular small time interval. 
• Average velocity: Average velocity is another kind of velocity which is defined as the ratio of the change in position that occurs to the change in time it takes to make that displacement change.

There exist other kinds of velocities too like angular velocity and terminal velocity.

ANGULAR VELOCITY

Angular velocity is one of the types of velocity. As the term itself defines, angular means rotation, and velocity means the displacement or distance it covers per unit time, but the motion is rotational about an axis. The angular velocity is also called the rotational velocity. Angular velocity basically measures the angular displacement the body makes and the displacement is denoted by theta. These angles are often measured in degrees and radians for the calculation of angular velocity or the term Rpm (revolution per minute ) is used.

For example, the angular velocity could be a car moving on a circular road at the same speed. 

TERMINAL VELOCITY

Terminal velocity is yet another classification of velocity. It is defined as the speed by which the object tends to fall freely under the influence of gravity through a gaseous or a liquid medium.

This terminal velocity is a constant velocity where the moving body has acceleration equal to zero. The factors affecting this terminal velocity are the shape the body is made up into and the opposing force or resistance the medium offers be it air or liquid.

For Example, the falling of a raindrop is an example of terminal velocity.

Some Most Common Examples Of velocity 

Velocity is associated with everybody that is in motion and has a lot of practical applications.

• A moving car with some velocity.
• A river flowing with some constant velocity
• Water flowing out from the tap with a velocity.
• The moon rotates around the earth with some uniform velocity.
• A ball being thrown from a certain level of height.

CONCLUSION

Hence the concept of velocity is used to measure the motion that begins at one position and ends at another. This velocity has a lot of practical applications in physics and which is countless. But the most important application that it serves is the determination of how a body which is moving will reach the destination it is supposed to reach.