Final answer:
Acceleration due to gravity on Earth and the Moon, and the effect of the moon's lack of atmosphere on falling objects.
Step-by-step explanation:
The subject of this question is Physics, specifically the concept of acceleration due to gravity on different celestial bodies, in this case, the Earth and the Moon.
On Earth, the acceleration due to gravity is approximately 9.8 m/s², while on the Moon, it is about 1.6 m/s². This means that objects will fall faster on Earth compared to the Moon.
The fact that the Moon has no atmosphere does not significantly affect the velocity of a falling object because the acceleration due to gravity is the same.
Therefore, the velocity of a falling moon rock would be the same regardless of whether there is an atmosphere or not.