You can't directly convert weight (measured in newtons) to mass (measured in kilograms) without knowing the acceleration due to gravity. Here's why and how to calculate it:

Understanding Weight and Mass

* Mass is the amount of matter in an object. It's a fundamental property and doesn't change based on location.

* Weight is the force of gravity acting on an object's mass. It depends on both the object's mass and the strength of the gravitational field.

Calculation

1. Newton's Second Law: The relationship between weight (force), mass, and acceleration is described by Newton's Second Law:

* Force (F) = Mass (m) * Acceleration (a)

2. Acceleration due to Gravity: On Earth, the acceleration due to gravity (g) is approximately 9.8 m/s².

3. Solving for Mass:

* We know the weight (F) is 250 N.

* We know the acceleration due to gravity (a) is 9.8 m/s².

* Rearrange the equation: Mass (m) = Force (F) / Acceleration (a)

* Plug in the values: m = 250 N / 9.8 m/s²

* Calculate: m ≈ 25.5 kg

Therefore, the mass of the rock is approximately 25.5 kg.