# Average Velocity

Written by Jerry Ratzlaff on . Posted in Fluid Dynamics

Average velocity, abbreviated as $$\bar {v}$$ or $$v_a$$, also called constant acceleration, is the average of any given velocities where the acceleration is constant.  The calculation for average velocity with zero accleration is shown below.

## Average velocity formulas

 $$\large{ \bar {v} = \frac{ 1 }{ 2 } \left( v_i + v_f \right) }$$ $$\large{ \bar {v} = \frac{ v_i \;+\; v_f }{ 2 } }$$ $$\large{ \bar {v} = \frac{ d }{ t } }$$

### Where:

$$\large{ \bar {v} }$$ = average velocity

$$\large{ d }$$ = displacement

$$\large{ v_f }$$ = final velocity

$$\large{ v_i }$$ = initial velocity

$$\large{ t }$$ = time