# What is the English word used to describe something like m/s or m/s/s ? [closed]

In science, some quantities have units. e.g. Mass (`kg`) , time (`s`), distance (`m`).

But what about quantities such as velocity (`m/s`) and acceleration (`m/s/s`) whose units are a combination of fundamental units and not a single unique unit.

What is the correct English term for something like `m/s` ? Is it a unit or not, or is there another word to describe such combination of units?

I'm looking for a one-word answer. The ... of velocity is m/s.

## closed as off-topic by chasly from UK, Marv Mills, RegDwigнt♦Nov 5 '15 at 13:14

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• Welcome. You could have answered this easily by Googling 'unit of velocity' . Then you would have found something like this, The SI unit of distance and displacement is the meter. The SI unit of time is the second. The SI unit of speed and velocity is the ratio of two — the meter per second. physics.info/velocity – chasly from UK Nov 5 '15 at 12:19
• Velocity is expressed in units of distance divided by time. – Hot Licks Nov 5 '15 at 12:19
• It's not really a subject for this site, but you should look up "fundamental units of measurement". Velocity can be expressed as a combination of fundamental units, therefore doesn't 'deserve' such a unit of its own. – JHCL Nov 5 '15 at 12:20
• I've voted to close. This question could have been answered with easily available online resources. – chasly from UK Nov 5 '15 at 12:21
• @JHCL - Velocity can be expressed as a fraction of C, a fundamental constant. – Hot Licks Nov 5 '15 at 12:23