Regarding WHAT IS E=MC2, the c is necessarily squared in order to allow for the fourth spatial dimension/TIME AND TIME dilation; AS gravity AND ELECTROMAGNETISM/energy are (CLEARLY) proven to be linked AND BALANCED opposites; AS the stars AND PLANETS are POINTS in the night sky; AS...
The fact that gravity/acceleration involves what is balanced inertia (and/or inertial resistance) is fully consistent with F=ma and E=mc2.
Time is necessarily possible/potential and actual on/in balance, as ELECTROMAGNETISM/energy IS GRAVITY. The fourth spatial dimension is consistent with time...
UNDERSTANDING TIME AND TIME DILATION IN CONJUNCTION WITH UNDERSTANDING HOW AND WHY ELECTROMAGNETISM/energy IS GRAVITY:
First, consider why and how it is that there is something instead of nothing. Now, we proceed !!!!
Consider what is the eye. (What is E=MC2 is consistent with wave-particle...