Question

what is meant by acceleration and its formula​ and its units

Answer 1

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. The SI unit for acceleration is metre per second square

Answer 2

$\huge\green{\mathfrak{Bonjour!!}}$

$acceleration = \frac{force}{mass}$
$Unit$=$\orange{\boxed{ms^{-2}}}$

$\large\red{Definition:}$
The rate of change of velocity with respect to time is known as acceleration...