What do you measure speed with?

Answer 1

miles per hour in america. kilometers per hour in most other places.

In the UK the only legal units of distance and speed for land transport are still the Statute Mile and yards, and miles per hour, respectively.

(For roads anyway. I'm not sure what the British railway system uses nowadays. I think it's still miles and mph, but historically they have always used miles, chains and yards for distances.)

Otherwise, metres / second in the Metric and its SI offshoot. Or feet per second.

It rather depends on what you're measuring: m/s or mm/s would make sense for something like the moving parts of a machine, say, but absurd for geological processes where mm/year would be appropriate. And in astronomy, km/s would save three 0s in the statistics, although you'd probably use index notation anyway.

Answer 2

Speed is often measured in units of distance divided by time; for example, meters/second, or kilometers per hour.There are also units of speed that are not derived from lengths and times - such as knots, or fraction of the speed of light (for instance, 1/10 of the speed of light might be expressed as "0.1c".

Answer 3

"Speed" is (the distance an object travels in some time) divided by (time to cover that distance).

Answer 4

The basic unit for measuring speed is metres per second.

Answer 5

a is the symbol for acceleration.