In a vacuum, both objects would reach the ground simultaneously. This is because the acceleration due to gravity is constant for all objects, regardless of their mass.

However, in the presence of air resistance, the heavier object will generally reach the ground first. Here's why:

* 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.

* Mass and air resistance: While the heavier object experiences a larger force of gravity, it also has a greater inertia. This means it resists changes in motion more strongly. However, if the air resistance is the same for both objects (a tricky scenario to set up in reality), the heavier object will be less affected by the air resistance relative to its overall weight.

* Net force: The net force acting on an object is the difference between the force of gravity and the force of air resistance. Since the heavier object has a larger gravitational force and a similar air resistance, it will have a larger net force acting on it. This results in a greater acceleration and a faster descent.

Important Note: The assumption of equal air resistance for objects of different masses is a simplification. In reality, the shape and size of the objects play a significant role in determining air resistance. For example, a feather and a bowling ball dropped together will not experience the same air resistance, and the feather will fall much slower.