Question

How do you calculate frequency from a given velocity value?

Answer 1

I am not sure I have interpreted your question correctly...

Explanation:

I think of (uniform) velocity, say, in a typical periodic rotational motion where you have:
`v=omegar`
where velocity (linear) `v` is related to the "circular" corresponding velocity called angular frequency, `omega`.
Angular frequency is a kind of circular velocity because it tells us how many radians are described in a period of time so to complete a circle it will take a time called Period (the time to complete an entire circle) `T`:
`omega=(2pi)/T`
Period is related to frequency `f` as: `T=1/f`:
and so:
`omega=2pif`
Collecting all our information we get:
`v=omegar`

`v=2pif*r`
so that we can evaluate frequency: `f=v/(2pir)`