Velocity is defined as speed in a certain direction, or vector.
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Velocity is a vector quantity that measures speed (and also includes direction). 55 mph is a speed. 55mph North is a velocity.
This is because the term "velocity" includes a specification both of a speed, and a direction. The direction changes, therefore the velocity changes.
No. It's confusing unless you're into physics or mathematics but velocity is a vector quantity with speed is one aspect. Velocity includes speed and the direction of motion. A car is going 60 miles per hour as speed. A car is going 60 MPH due north is velocity.
Velocity includes direction. For example, "the car is driving 100 km/h" refers to speed, whereas, "the car is driving 100 km/h [North]" is velocity
Velocity is speed and direction