If a person falls from a plane without any form of parachute or safety equipment, it is highly likely that they would die upon impact with the ground. The exact time of death would depend on various factors such as the altitude from which they fell, the position of their body during the fall, and the nature of the terrain where they land.
When a person falls from a significant height, they will initially experience a state of free fall, during which they will accelerate due to gravity. As they gain speed, the air resistance acting against their body will increase. Eventually, they will reach a terminal velocity, which is the maximum speed at which their body can fall through the air. Terminal velocity is typically around 120 miles per hour (193 kilometers per hour) for the average human body in a belly-to-earth position.
At the moment of impact with the ground, the person will undergo an extreme deceleration over a very short period of time. This sudden deceleration can cause severe injuries or be fatal, as it subjects the body to immense forces. Injuries may include fractures, internal bleeding, damage to vital organs, and trauma to the head and spine. Survival without any protective measures is highly unlikely.
It is important to note that this information is provided for educational purposes only. Deliberately jumping out of a plane without proper safety equipment is an extremely dangerous and potentially deadly act. If you find yourself in such a situation, it is crucial to follow appropriate safety protocols and use available emergency equipment, such as parachutes, to increase your chances of survival.