8. "Energy" from the concept of time speed
Two masses at different heights in a gravitational field have different
potential energy. We can infer that this potentialenergy reflects the different
time speed prevailing at each of the locations of the two masses(8.a). Therefore
we can represent what we call "energy" as a difference in time speed(8.b). As we
will see later, "energy" is a static concept only proper to our reality(8.c).
