Here's why:
* Speed is a scalar quantity, meaning it only has magnitude (how fast something is moving).
* Velocity is a vector quantity, meaning it has both magnitude (how fast something is moving) and direction.
Example:
* A car traveling at 60 miles per hour has a speed of 60 mph.
* A car traveling at 60 miles per hour north has a velocity of 60 mph north.
Therefore, velocity tells you not only how fast something is moving but also where it's going.
