Answer the following question given this paragraph: 

Speed represents how quickly an object is moving through space. Velocity is speed with a direction, making it a vector quantity. If an object’s velocity changes with time, the object is said to be accelerating. As we’ll see in the next chapters, understanding the acceleration of an object is the key to understanding its motion. We will assume constant acceleration throughout this chapter.


Q: What is the name for speed with a direction?


A:
velocity