Question

what is acceleration

Answer 1

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THE AMOUNT BY WHICH A SPEED OR VELOCITY INCREASES (AND SO A SCALAR QUANTITY OR A VECTOR QUANTITY).

THE CHANGE OF VELOCITY WITH RESPECT TO TIME (CAN INCLUDE DECELERATION OR CHANGING DIRECTION).

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Answer 2

acceleration is the rate of change of velocity of an object with respect to time. An object's acceleration is the net result of any and all forces acting on the object, as described by Newton's Second Law