Why an object with mass can't reach the speed of light

Thinking about whether the explanation works, since the equation F = ma really only works in classical mechanics when no special relativity is involved. F = ma is also under the assumption that the mass doesn't change as the velocity of the object changes (think of F = dp/dt), which is the case for special relativity.
What I'd do to prove this is to use the equation E^2 = (mc^2)^2 + (pc)^2, where m is the rest mass (mass when object is not moving) and p is the relativistic momentum (or gamma * rest mass * velocity). For an object at the speed of light, gamma is infinite, and so you can then conclude that you'd need infinite energy for such object, which isn't possible.

Fuck me Jelly head! Where has all this utter shite come from! Doesn't sound like the Hepple I knew from Pegswood lol....... But in a strange way it does.....

Well, 99% the speed of light is practically the same. Seems we only increase mass a few times over until we start getting into that last percent. To hell with that 1 %…. Now if only space was really a vacuum and hitting a stationary pebble in space at 99% the speed of light wouldn’t cause an impact so forceful that it causes the Big Bang to reverse.