The speed and direction of a moving body is called its velocity.

Here's why:

* Speed tells you how fast something is moving.

* Direction tells you which way it's moving.

Velocity combines both of these elements into a single value. For example:

* A car traveling at 60 miles per hour north has a velocity of 60 mph north.

* A ball thrown at 20 meters per second east has a velocity of 20 m/s east.