It could be metres per second (radio waves), or centimetres per second (microwaves), down to nanometres per second (gamma rays).
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Hertz (Hz) is the SI unit of frequency, equal to one cycle per second.
Velocity is distance per unit time, it is measured in meter per second. (m/s)
That's a metric unit for acceleration.
Feet per second is a unit of velocity, but not necessarily the same thing. Velocity could be in meters per hour or feet per second could be a measure of speed, which does not take direction into account, as velocity does.
ms^-2 or m/s^2 is a unit used to measure acceleration.