If a large rock and a small rock are dropped from the top of a building Physics wise would one hit the ground first or not, and why?

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According to the principles of classical physics and neglecting factors such as air resistance, both the large and small rock would hit the ground at the same time. This concept is commonly known as the "Galileo's principle of free fall" or the "equivalence principle."

The reason behind this is that in the absence of air resistance, the acceleration due to gravity is the same for all objects regardless of their mass. This means that both the large and small rock experience the same gravitational force, causing them to accelerate at the same rate.

However, in the real world, air resistance does exist and becomes increasingly important as the objects have a larger surface area. Therefore, if the large rock has a significantly greater surface area than the small rock, it may experience higher air resistance, causing it to fall slightly slower than the small rock.