Final answer:
The SI unit of mass is the kilogram, and the SI unit of force is the Newton. Kilograms are defined based on a platinum-iridium standard cylinder, while Newtons are defined as one kilogram meter per second squared.
Step-by-step explanation:
The International System of Units (SI) unit of mass is the kilogram, and the SI unit of force is the Newton. Therefore, the correct answer to the question is: The SI unit of mass is the kilogram, and the SI unit of force is the Newton.
The kilogram is defined as the mass of a specific platinum-iridium cylinder, and it is the base unit of mass in the SI system. Replicas of this standard are kept at institutes around the world, including the National Institute of Standards and Technology in the United States.
The Newton is the SI unit of force and is defined as one kilogram meter per second squared (kg·m/s²). This can be remembered through Newton's Second Law of Motion, F = ma (force equals mass times acceleration), where mass is measured in kilograms and acceleration in meters per second squared.