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Stall Speed or Escape Velocity?

How many of you, like us, struggled to articulate to your physics teacher the difference between velocity and speed? To most of us in the office it remains a mystery and is as difficult a question to answer today as it was all those years ago. Thanks to the wonder of Google we have found what can only be described as a text book answer to this challenging question;

In physics, speed is defined as the rate of increase (or decrease) of distance travelled, with time. Linear velocity is the rate of increase (or decrease) of distance traversed by a body in a particular direction. Speed is defined with the omission of reference to direction. Thus, velocity is a vector quantity and speed is a scalar one.

Is everything clear now? (Well, not really, but let’s move on)

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