In John Davis's model, the Earth is an infinite plane and is 9000 kilometers deep.

. . .

A3: In John Davis's model, the infinite plane produces a finite gravitational field with a downward pull. Here is the mathematical formulation behind this model.

If a human being jumps into the air with X amount of force, that force is countered by the force of gravity which causes an acceleration of 9.81/(M)s^2

toward the ground, making a person hit at a given speed. However, since the distance of an object from the surface, over a given amount of time, can effect

the velocity of the object, as acceleration is the change in velocity over time, it is either the object that is accelerating, or the plane,

toward which the object is falling. Let us propose, however, that 2 objects are falling. One object is falling at the acceleration of gravity, and one is

countering the force of gravity with thrust in the opposite direction. The objects velocity towards the ground ever increases as shown by a logarithmic

progression of change in position due to gravity and terminal velocity. However, the object that counters the acceleration of the force of gravity stays parallel to the surface. If this is true,

then either the amount of energy the object is using to oppose the force is increasing at the same rate as the change of position of the falling object,

with respect to the ground, or the ground itself is stationary, and the objects move toward a constant force.

Occam razor time.