technically you can express it in many ways, but the most common is miles per hour or kilometres per hour, car magazines etc and the tv show Top Gear measure cars in horse power:)
With a car accelerator and a whole lot of skill
a metre or a car lengthAdded; (in the US) one car length for every 10 miles-per-hour of speed.
Speed or velocity can be expressed as the distance divided by time.
mbps
Speed is the rate of change in what?
Expressed in kilometres per hour, this is equal to 300/6 = 50 kilometres per hour.
velocity vector
The moon's acceleration is expressed as a change in direction.
The speed of the car.
it is expressed in hertz u can go from a 1 nanohertz to 1 terahertz
nanoseconds
second