Both objects, the hammer and the nail, hit the ground at the same time because they are both subject to the same force of gravity. Gravity is the force that pulls objects towards the Earth's center. Regardless of their mass or size, when objects are dropped from the same height, they will experience the same acceleration due to gravity, which is approximately 9.8 meters per second squared. This means that both the hammer and the nail will accelerate at the same rate, causing them to hit the ground simultaneously.
