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In conclusion, speed and velocity are kinematic quantities that have distinctly different definitions. Speed, being a scalar quantity, is the rate at which an object covers distance. The average speed is the distance (a scalar quantity) per time ratio. Speed is ignorant of direction. On the other hand, velocity is a vector quantity; it is direction-aware. Velocity is the rate at which the position changes. The average velocity is the displacement or position change (a vector quantity) per time ratio.
Velocity is a vector quantity, and average velocity can be defined as the displacement divided by the time.For the special case of straight line motion in the x direction, the average velocity takes the form:he units for velocity can be implied from the definition to be meters/second or in general any distance unit over any time unit. You can approach an expression for the instantaneous velocity at any point on the path by taking the limit as the time interval gets smaller and smaller.