# Formula Average Velocity Start position    End position    Start time    End Time

## Average velocity

Unit
The average velocity of a body, e.g. an airplane or a car. It is defined as the distance traveled $$\Delta s = x_2 - x_1$$ per time $$\Delta t = t_2 - t_1$$: $v ~=~ \frac{\Delta s}{\Delta t}$The sign of the average velocity determines whether the body moves to the right (positive $$v$$) or to the left (negative $$v$$).

Example: The total distance is $$\Delta s = -20 \, \text{m}$$ and the time taken is $$\Delta t = 4 \text{s}$$. Then the average velocity is:$v ~=~ \frac{-20 \, \text{m}}{4 \text{s}} ~=~ -5 \, \frac{\text m }{ \text s }$

Since the average velocity is negative, the body moves to the left.

## Start position

Unit
Position of the body (on the x-axis) from which the average velocity is to be calculated.

## End position

Unit
Position of the body (on the x-axis) up to which the average velocity is to be calculated.

## Start time

Unit
The time when the body has the position $$x_1$$.

## End Time

Unit
The time when the body has the position $$x_2$$.