Question

Definition of acceleration ?
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Answer 1

Answer:

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.

Explanation:

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Answer 2

Answer:

Accelerations are vector quantities.

Explanation:

In mechanics, acceleration is the rate of change of the velocity of an object with respect to time. The orientation of an object's acceleration is given by the orientation of the net force acting on that object.

Information source : Wikipedia