What is defined as 1 Newton in terms of mass and acceleration?

A Newton is defined as the amount of force required to accelerate a mass of one kilogram at a rate of one meter per second squared. This is described by Newton's second law of motion, which states that force equals mass times acceleration (F = ma). In this relationship, if you take a mass of 1 kg and accelerate it at 1 m/s², the resulting force is exactly 1 Newton. Therefore, the unit of force, the Newton, is thus expressed in terms of mass (in kilograms) multiplied by acceleration (in meters per second squared), leading to the correct definition being 1 kg m/s².