Question

what is meant by acceleration

Answer 1

hey your ans is here

....
Acceleration of a body is a measure of how fast (means, at what rate) velocity of a body is varying.
mathematically,
if Velocity is a continous function in time (of course, it is)
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As velocity is a vector quantity, acceleration is also a vector quantity.

Answer 2

the rate of change of velocitY in per unit time is known as acceleration. it is a vector physical quantity .it's si unit is m/s -2