Answer: The mass of the grapefruit is 0.5 kilograms
Explanation: Weight is the force of gravity acting on an object. It is measured in newtons. Mass is the amount of matter in an object. It is measured in kilograms.
The weight of an object on Earth is equal to its mass multiplied by the acceleration due to gravity. The acceleration due to gravity on Earth is 9.81 meters per second squared.
So, the weight of the grapefruit is 4.9 newtons.
Weight = Mass * Acceleration due to gravity
4.9 newtons = Mass * 9.81 meters per second squared
Mass = 4.9 newtons / 9.81 meters per second squared.
Mass = 0.5 kilograms
Therefore, the mass of the grapefruit is 0.5 kilograms.