The time rate of change of position of the object in any direction is called the **speed of the object.**

Its unit is** m/s**. It is a** scalar quantity**.

Its dimensional formula is **[M ^{0} T^{-1}]**.

## Uniform Speed:

If an object covers equal distances in equal intervals of time, then its speed is called uniform speed.

## Non-Uniform Speed or Variable Speed:

If an object covers unequal distances in equal intervals of time, then its speed is called non-uniform or variable speed.

## Average Speed:

The ratio of the total distance traveled by the object to the total time taken is called the average speed of the object.

If a particle travels distances s_{1} , s_{2} , s_{3} …s_{n} with speeds v_{1} , v_{2} , v_{3} …v_{n} then

If particle travels equal distances ( s_{1} = s_{2} = s) with velocities v_{1} and v_{2} , then

If a particle travels with speeds v_{1}, v_{2}, v_{3} …v_{n}, during time intervals t_{1}, t_{2}, t_{3} …t_{n} then

If particle travels with speeds v_{1} and v_{2} for equal time intervals, i.e., t_{1} =t_{2}, =t_{3} then

When a body travels equal distance with speeds v_{1} and v_{2} the average speed (v) is the

harmonic mean of two speeds.

## Instantaneous Speed:

When an object is traveling at a variable speed, then its speed at a given instant of time is called its instantaneous speed.

## How useful was this post?

Click on a star to rate it!

Average rating / 5. Vote count:

## We are sorry that this post was not useful for you!

Let us improve this post!

Thanks for your feedback!