Question

what is acceleration ??​

Answer 1

$\huge\mathcal\purple{AnsWer}$

-{>Acceleration is the rate of change of velocity with time.

-}>An object's acceleration is the net result of all forces acting on the object, as described by Newton's Second Law.

-}>SIUnit=m/s²

Answer 2

Acceleration is the change of velocity in unit time. The S.I. unit of acceleration is m/s².

The negative acceleration is called as retardation.