Question

How do you find the average velocity over an interval?

Answer 1

If the moving object is undergoing constant acceleration, then

`v_(\rm avg)=\frac{v_i+v_f}2`

(take the average of the initial and final velocities, if they're given)

If you don't know the acceleration or initial/final velocities, then you have to resort to the usual definition,

`v_(\rm avg)=(\Delta x)/(\Delta t)`

where
`\Delta x` is the change in position and
`\Delta t` is the duration of the interval.