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Rationale

Watch this video (listen to air controllers)

The content of their conversation is about velocity, Deceleration/Acceleration, direction, height in degrees above see level, among others.

In busy airports, there are more than five landing/takeoffs in a single minute. This can be complicated further by wind like Feb 14th 2014 in UK.

A clear understanding of Velocity and Acceleration is important to make this possible and avoid catastrophic accidents.

This is just one example of the various needs for understanding Velocity and Acceleration.