average speed calculator

i want to calculate
initial speed (v0) = m/s
speed(v) = m/s
average speed(va) = m/s
 

the average speed is a quantity that describes the average speed of an object's movement. it roughly represents the speed of an object's movement within a period of time.

average speed formula

average speed: va = ½ (v0 + v)
initial speed: v0 = 2xva - v
speed: v = 2xva - v0