Velocity

Speed with direction.

When we look at the speedometer of a moving vehicle we see its speed. When pilots go flying they need to know the wind speed and its direction. In other words they need to know the velocity of the wind.
The graph below shows the speed and velocity of a rocket as it is launched vertically into the air. Notice that the speed is the magnitude of the rate at which distance is changing. Velocity, on the other hand, is the magnitude of the rate at which distance is changing and in what direction. In this case a positive velocity indicates upward motion while a negative value indicates a downward motion.

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