Here's why:

* Velocity is a vector quantity: This means it has both magnitude (speed) and direction. For example, "50 mph east" is a velocity.

* Scalars are quantities with magnitude only: Examples include speed (50 mph), temperature (25 degrees Celsius), and mass (10 kg).

Therefore, velocity cannot be a scalar. It must always be a vector.

If you're looking for a term that might be related, it's possible you're thinking of:

* Speed: This is the magnitude of velocity. It tells you how fast something is moving, but not in what direction.

* Scalar quantity: This is a general term for a quantity with magnitude only. Velocity is not a scalar quantity.

Let me know if you have any other questions!