Question

what is the definition of velocity? reference line on a graph speed in a specific direction rate of change in velocity change in position

Explanation:

Velocity is a vector quantity in physics. It combines the idea of speed (a scalar quantity) with a specific direction. For example, a car moving at 60 miles per hour to the north has a velocity. The rate of change in velocity is acceleration, change in position is displacement, and a reference - line on a graph is not related to the definition of velocity.

Answer:

Speed in a specific direction