Acceleration, on the other hand, is the rate of change of velocity of a body. This implies that if it is not in motion or at rest, which is a kind of suspended motion, it thus does not exist. That is to say, in order to exist, a thing must exhibit some kind of motion. Speed is a scalar quantity, as the car's speed is 25 mph. It is the magnitude quantity of the vector called velocity, the other vector quantity being direction.
Speed is measured by the distance covered divided by the elapsed time.
This is also the formula for constant or uniform speed. If you persisted to this point, I congratulate you. All Rights Reserved, Dynamic Chiropractic, 2001.