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This is a physics question about the forces acting on a stone thrown horizontally near the surface of the Moon, where there is no atmosphere. Let’s analyze the forces in both horizontal and vertical directions.

- **Horizontal Force**: Since there is no atmosphere on the Moon, there is no air resistance, meaning that after the stone is released, no horizontal force acts on it (Newton’s First Law). Therefore, the horizontal force is **zero** after the release.

- **Vertical Force**: The stone will experience the Moon’s gravitational pull in the vertical direction, which is a constant force acting downwards. Thus, the vertical force is **constant** due to the Moon's gravity.

Given these points, the correct answer is:
- Horizontal Force: **zero**
- Vertical Force: **constant**

The correct row is **C**.

Would you like more details or have any further questions?

Here are 5 related questions to explore further:
1. What would happen to the stone if it were thrown horizontally on Earth instead of the Moon?
2. How does air resistance affect the horizontal force on Earth?
3. What is the significance of Newton's First Law of Motion in projectile motion?
4. How does gravity on the Moon compare to gravity on Earth?
5. How do different planets' atmospheres affect projectile motion?

**Tip**: In projectile motion, horizontal and vertical motions are independent of each other.

An astronaut throws a stone horizontally near to the surface of the Moon, where there is no atmosphere. Which row describes the horizontal and vertical forces acting on the stone after release?

Learn about the forces acting on a stone thrown horizontally on the Moon's surface. This physics problem explores how the absence of an atmosphere affects horizontal and vertical forces due to gravity. Suitable for high school physics students.

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