/sci/ - Science & Math

I'd really appreciate an explanation here...

I get the following points

1) Mass and Energy are equivalent. A flash light loses mass when it is turned on, because some photos escape. And this relationship is captured by E = MC^2.

2) Gravity and acceleration are equivalent. If you're accelerating in space, or are on a planet with a large mass, you will experience the same thing.

3) The speed of light is constant, and faster-than-light travel is impossible.

Now how do you go from points 1 and 2 to point 3? I keep reading that faster-than-light travel is impossible because as you approach C your energy approaches infinity, but how do you derive this idea from the postulates above?