Speed
Velocity


Rate of change of distance in regard to time

The rate in time in which something travels or operates.

How long it takes for an object or person or animal to get from one point to another.

What is
The speed of the baseball



The speed of the car
          mph
                                         miles per hour

The speed of a horse


The speed of the racer



speed of light
http://unmuseum.mus.pa.us/speed.htm

http://csep10.phys.utk.edu/guidry/violence/lightspeed.html

http://www.pbs.org/wgbh/nova/physics/speed-light.html