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Acceleration
Acceleration is the rate of change of velocity.
Average speed
Average speed is the total distance traveled divided by the total time taken. It’s a scalar quantity.
Average velocity
Average velocity is the total displacement divided by the total time taken. It’s a vector quantity.
Instantaneous acceleration
Instantaneous acceleration is the acceleration at a specific moment in time.
Scalar quantities
Scalar quantities have only magnitude and no direction.
Vector quantities
Vector quantities have both magnitude and direction.