Answer: Decreases.
- A Increases
- B Decreases
- C Stays constant
- D Becomes zero at 1 km
Correct answer: B. Decreases
Explanation: g = GM/r<sup>2.</sup> As r increases (going higher), g decreases.
g is maximum at Earth's surface; going up, it falls off as 1/r² (inverse-square); going down, it falls off linearly with depth (since only the mass enclosed within radius r contributes), reaching zero at the centre.
Concept context
Universal gravitation, orbital mechanics, gravitational potential, and escape velocity.