The vector quantity that includes both the speed and direction of an object is velocity.

Here's why:

* Speed is a scalar quantity, meaning it only has magnitude (how fast something is moving).

* Direction is essential for understanding how something is moving in space.

* Velocity combines both speed and direction, making it a vector quantity.

Example:

* A car traveling at 60 mph is its speed.

* A car traveling at 60 mph north is its velocity.