The term that describes both the speed and direction of an object's motion is velocity.

Here's why:

* Speed tells you how fast an object is moving.

* Direction tells you which way an object is moving.

Velocity combines both pieces of information. For example, saying a car is traveling at 60 miles per hour doesn't tell you where it's going. But saying it's traveling at 60 miles per hour *north* tells you both its speed and direction.