the speed of a car can be measured in s^-1 m right...

it could be said that a speed of a car the velocity was 15 s^-1 m which is perfectly acceptable...

by definition 15 s^-1 m can also be written as 15 Hz m just by definition...

what on earth does that mean??? is velocity not really a vector but a wave???

>.>

2 answers

You are going to damage yourself by thinking.
Speed has units of
m s^-1 (or m/s or s^-1 m). You could call that 15 Hz m, since 1 Hz = 1 s^-1, but no one uses those units.

No, velocity is not a wave. Hz measures how many waves go by per second; m/s measures how far an object or a wave moves in a second