Question

what is the Newton's second law of motion ?

Answer 1

second law states that the acceleration of an object is dependent upon two variables - the net force acting upon the object and the mass of the object.

Answer 2

according to the Newton second law states that acceleration depend on force of the object and mass of the object.
in symbols a=F/m
(or)
F=ma
another definition is,the rate of change of momentum is called force .
F=dp/dt
it is Newton second law.