Question

what is acceleration?​

Answer 1

Acceleration:-

It is defined as the change in velocity with respect to time.

It is a vector quantity.

Acceleration = $\sf\dfrac{v - u}{t}$

Si unit is m/s²

Answer 2

Acceleration of a body or an object is defined as the change in velocity per unit time.

Acceleration of an object may also be defined as the rate of the change of the velocity of the object.

Hence,

Acceleration = change in velocity ÷ time taken.