* Initial velocity: If the object is simply dropped, its initial velocity is 0. If it is thrown, its initial velocity will be the speed at which it is thrown.

* Acceleration due to gravity: This is approximately 9.8 m/s² near the Earth's surface. It means that the object's speed increases by 9.8 meters per second every second it falls.

* Air resistance: This opposes the object's motion and will slow it down. The amount of air resistance depends on the object's shape, size, and speed.

Here's a simple formula to calculate the speed of a free-falling object:

v = u + at

Where:

* v = final velocity (speed)

* u = initial velocity

* a = acceleration due to gravity (9.8 m/s²)

* t = time of fall

Example:

If an object is dropped from rest (u = 0) and falls for 3 seconds, its final velocity would be:

v = 0 + (9.8 m/s²) * 3 s

v = 29.4 m/s

Important Notes:

* This formula assumes no air resistance. In real-world scenarios, air resistance plays a significant role.

* The speed of a free-falling object increases continuously until it reaches terminal velocity, which is the maximum speed it can achieve due to air resistance.

* The direction of the object's speed is downwards.

Let me know if you have any other questions.