In our physical reality, objects can gain acceleration or speed through various mechanisms, including the influence of gravitational fields. When an object is within a gravitational field, such as the gravitational field of a planet, it can experience a gravitational force that causes it to accelerate.
According to Newton's laws of motion, when a force acts on an object, it causes the object to accelerate. In the case of gravity, the force of gravity pulls objects towards the center of mass of the gravitational body. As a result, objects near the surface of a planet will experience a gravitational force directed towards the planet's center.
If an object is initially stationary, the gravitational force acting on it will cause it to accelerate towards the planet. As the object accelerates, its speed increases, allowing it to move through the spatial dimensions and descend further into the gravitational field.
It's important to note that the specific acceleration and speed gained by an object depend on factors such as the mass of the object, the mass of the gravitational body, and the distance between them. Additionally, other forces, such as air resistance or friction, can also influence the object's motion.
In summary, a stationary object can gain acceleration and speed in the spatial dimension by experiencing the force of gravity, which causes it to move towards the center of the gravitational body.