Question

what is acceleration
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Answer 1

Acceleration is the rate of change of velocity. Usually, acceleration means the speed is changing, but not always. When an object moves in a circular path at a constant speed, it is still accelerating, because the direction of its velocity is changing.

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Answer 2

Acceleration is defined as the change in the velocity vector in a time interval, divided by the time interval. ... For example, if velocity is expressed in metres per second, acceleration will be expressed in metres per second per second.

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