Answer to Question #25020 in Mechanics | Relativity for Lakiya
Speed is classified as a scalar quantity because it only has magnitude (numerical value and unit of measurement) such as 50 mi/h.
Velocity is classified as a vector quantity because it has magnitude and direction, 50 mi/h north. By including direction, you are giving more information than a scalar quantity (requiring one unit).
It's just the way we define it.
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