# Equation for Velocity?

GlobalDuty
Does anyone know if there exists an equation for finding final velocity by just knowing:
1) Time, 2)final and initial position and 3)constant acceleartion?

$-g=\frac{v'-v}{t}$
$\overline{v}=\frac{x_f - x_0}{t_f - t_0}=\frac{x}{t}$
this gives $\overline{v}= \frac{\Delta v}{\Delta t}$ since $\frac{x'-x}{t'-t}$.
where x is position, t is time and the lower indices are f which resembles ''final'' and the 0 resembles ''initial''.Using albegra to calculate velocity is given as $x=x_0 +vt$.