One Newton is defined as which of the following?

One Newton is defined as the force required to accelerate a one-kilogram mass by one meter per second squared. This definition comes from Newton's second law of motion, which states that force equals mass times acceleration (F = ma).

In this context, if a mass of 1 kilogram is accelerated at a rate of 1 meter per second squared, the force applied to achieve this acceleration is 1 Newton. Therefore, the correct answer reflects this fundamental relationship in physics, affirming that 1 Newton is equivalent to 1 kg·m/s². This definition underscores the importance of both mass and acceleration in understanding force, making this the accurate choice among the options provided.