Is Newtons Second Law True

Newton’s second law of motion can be formally stated as follows: The acceleration of an object as produced by a net force is directly proportional to the magnitude of the net force, in the same direction as the net force, and inversely proportional to the mass of the object.

What is wrong with Newton's second law?

Yes, it is partially wrong. Newton’s second law states that force on a body is equal to rate of change of momentum, that is. F=dp/dt. Now, if you consider momentum to be equal to mass times velocity, that is. p=mv.

Why is Newton's second law the real law?

This can be proved by showing that first law and third law are contained in second law of motion. That is if no force is acting on the body then its acceleration is zero, means if a body is at rest, it remains at rest and if the body is moving in straight line with constant velocity, it continues to do so.