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An acceleration is not a velocity - it is the rate of change of velocity.

In SI units, the units of velocity are meters/second.

Acceleration is the rate of change of velocity, per unit time - how fast the velocity changes. Therefore, its units are velocity / time. In SI units, this gives you (meters/second) / second, usually written as meters/second2.

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How does the unit of time enter twice in the unit of acceleration?

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Why does the unit of time enter twice in the unit accereration?

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