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## Definition of velocity in physics

Velocity is defined as:”The rate of displacement of a body is called its velocity.”The velocity tells us not only the speed of a body but also the direction along which the body is moving.Velocity of a body is a vector quantity.It is equal to the displacement of a body in unit time.

## What is the formula for Velocity?

Here **d** is the displacement of the body moving with velocity **v** in time t.

## Unit for velocity in physics:

SI unit of velocity is the same as speed i.e.,meter per second.

## Uniform velocity

“A body has uniform velocity if it covers equal displacement in equal intervals of time however short the interval may be.”In equation( **d**=**v** t ) **v **is the average velocity of of a body during time t .It is because the velocity of the body may be changing during the time interval t.However,in many cases the speed and direction of a body does not change .In such a case the body possesses uniform velocity.That is the velocity of a body during any interval of time has the same magnitude and direction.

## Average velocity definition

“Average velocity is the total displacement covered in any direction in total interval of time.”or ratio of total displacement to time is called average velocity.

## average velocity formula

## Example:

Given data is:

## Difference between speed and velocity in physics

### Watch also video about instantaneous velocity:

## Relationship between power and velocity:

It is some times,convenient to express power in terms of a constant force F acting on an object moving at constant velocity v.For example,when the propeller of a motor boat causes the water to exert a constant force F on the boat,it moves with a constant velocity V.The power delivered by the motor at any instant is given by:

The dot product of force and velocity is called power.

See also **terminal velocity**:

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