In the sequence below, I will do some simple algebraic manipulation/rearranging-- and turn Newton's 2nd law into Einstein's Mass-Energy Equivalence:
F=ma -----> E=mc^2
* Force = mass x acceleration
*(1) work = force x distance
*(2) energy = work
* therefore, (3) energy = force x distance
* Since f=ma, (4) energy = mass x acceleration x distance
*(5) acceleration = speed / time
*(6) speed = distance / time
* So, (7) acceleration = distance / time / time OR--
* acceleration = distance / time^2
*(8) Energy, then, = mass x distance/time^2 x distance
* which leads to (9) energy = mass x distance/time x distance/time OR--
* energy = mass x distance/time x distance/time
* Since distance/time = speed, then (10) Energy = mass x speed^2
* And if speed = c (speed of light), then (11) E= m x c^2!
...E= mc^2 has been implicit in F=ma all along!
What do you think of that?