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Donabeiborjago
Answered

it refers to the rate at which an object changes its portion​

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Yamete5040go

Answer:

VELOCITY

is a vector quantity that refers to "the rate at which an object changes its position." Imagine a person moving rapidly - one step forward and one step back - always returning to the original starting position. While this might result in a frenzy of activity, it would result in a zero velocity.
Rate of Change of Velocity:

Thus, the rate of change of the velocity of an object is negative if the speed of the moving object decreases with time; on the other hand, the rate of change of the velocity of an object is positive if the velocity of the moving object increases with time.

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