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Average Velocity and Average Speed

The average velocity gives the information about how fast an moving object changing its position with time.

Average velocity is defined as the change in position or displacement dividing by time interval , in which displacement occurs.

Where, and are the positions of the object at time and , respectively; and the average velocity is represented by the ( bar).

The
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Instantaneous Velocity and Speed

As we know, the average velocity gives the information about how fast an object changing position with time interval. But for next instant of time information of object is not given by average velocity.

Therefore to know this, instantaneous velocity or simply velocity at an instant time is defined as the limit of the average velocity as the time interval becomes infinitesimally small.

Where
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