Answer: at the poles.
- A at the equator
- B on a mountain top
- C at the poles
- D at sea level near the equator
Correct answer: C. at the poles
Explanation: Earth is flattened at the poles (smaller radius) and rotation reduces effective g at the equator, so g is maximum at the poles.
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.