Here's why:
* Speed tells you how fast an object is moving.
* Direction tells you which way the object is moving.
For example, a car traveling at 60 miles per hour (mph) has a speed of 60 mph. But, to fully describe its velocity, you need to know the direction it's moving, like "60 mph east."
Velocity is a vector quantity, meaning it has both magnitude (speed) and direction.
