# 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 formula

$$\large{ \bar {v} = \frac{ 1 }{ 2 } \; \left( v_i + v_f \right) }$$
Symbol English Metric
$$\large{ \bar {v} }$$ = average velocity $$\large{\frac{ft}{sec}}$$ $$\large{\frac{m}{s}}$$
$$\large{ v_f }$$ = final velocity $$\large{\frac{ft}{sec}}$$ $$\large{\frac{m}{s}}$$
$$\large{ v_i }$$ = initial velocity $$\large{\frac{ft}{sec}}$$ $$\large{\frac{m}{s}}$$