Here's why:
* Gravity: Gravity pulls all objects towards the center of the Earth with the same acceleration, regardless of their mass or size. This acceleration is approximately 9.8 m/s².
* Air Resistance: Air resistance is a force that opposes the motion of objects through the air. It depends on factors like the object's shape, size, and speed. In a vacuum, there is no air, so there is no air resistance.
Therefore, in the absence of air, all objects, regardless of their mass or shape, will fall at the same rate and reach the ground simultaneously. This was famously demonstrated by astronaut David Scott on the Moon, where he dropped a feather and a hammer, and they both fell at the same speed.
