Question

explain second law of motion in brief give example

Answer 1

The second law of motion, is -
The applied force is directly proportional to , the total momentum/time taken.
i.e - force = mass x. accelaration.

Answer 2

Newton’s second law basically states that as distance increases, the force of attraction between two objects, or the force of gravity, decreases. It also gives us the formula f(net) = ma.
Newton's second law of motion pertains to the behavior of objects for which all existing forces are not balanced. The second law states that the acceleration of an object is dependent upon two variables - the net forceacting upon the object and the mass of the object. The acceleration of an object depends directly upon the net force acting upon the object, and inversely upon the mass of the object. As the force acting upon an object is increased, the acceleration of the object is increased. As the mass of an object is increased, the acceleration of the object is decreased.
Example  of Newton's 2nd Law :- If you use the same force to push a truck and push a car, the car will have more acceleration than the truck, because the car has less mass.