acceleration
"Acceleration is like fire: a good servant and a cruel master. Acceleration when you want it is one of the true joys of motoring"
S.I. unit of acceleration is m/s per second, also called m/s2. Acceleration is like the "speed of the speed"; Acceleration is "how fast fast changes!
"Acceleration is like velocity, its directional. If you were to change your arms speed or direction, or even both, you change velocity and you accelerate. "
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