Speed is scalar, directionless, while velocity is vector, incorporating direction. The example of a car's loop travel illustrates the distinction between speed and velocity.
Speed is measured without direction, while velocity is measured with direction. Speed is a scalar quantity, only having magnitude, whereas velocity is a vector quantity, indicating both magnitude and direction. An example differentiating average speed and velocity would be a car traveling in a loop, where the speed is constant but the velocity changes due to direction.
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