When an object is moving along a straight line at a variable speed, we can express the magnitude of the rate of motion in terms of average velocity.It is the same way as we calculate average speed.
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For the instantaneous value of average velocity, average speed and average velocity are equal.
All of them...?
Only if the two velocities are equal in magnitude but in opposite directions.
It's not. Unless you add a direction to speed it will not become velocity. Since positive and negative are sometimes used to denote direction, absolute value of velocity may equal speed (certain situations)
yes