Final answer:
The unit equivalent to newtons is kg·m/s², represented by option D, as per Newton's Second Law which defines force in terms of mass and acceleration. So the correct answer is D.
Step-by-step explanation:
The student asked which of the following units are equivalent to newtons. The correct answer is kg·m/s², which is represented by option D. The SI unit of force is Newton (N), which fundamentally breaks down to kg·m/s². This relationship can easily be remembered through Newtown's Second Law of motion, which is represented by the formula F = ma, where F stands for force, m for mass (in kilograms), and a for acceleration (in meters per second squared).