Here's why:
* Gravity: The force of gravity acts equally on all objects, regardless of their mass. This means both objects will accelerate downwards at the same rate (approximately 9.8 m/s²).
* Air Resistance: Air resistance is a force that opposes the motion of an object through the air. The amount of air resistance an object experiences depends on its shape, size, and speed. A heavier object will experience a greater force of air resistance than a lighter object, assuming they have the same shape and size.
* Result: Because the heavier object experiences greater air resistance, it will slow down slightly more than the lighter object. This means the lighter object will reach the ground first.
Important Note: In a vacuum, where there is no air resistance, both objects would fall at the same rate and reach the ground simultaneously. This was famously demonstrated by Galileo Galilei.