Your are wrong because this is about achieving the speed of light, not acceleration over ground in a constant environment.
EMC2 is different kettle of fish, where mass is the driving factor. You essentially need infinite fuel to reach the speed of light using chemical means. There is no “cutting the engines”.
According to the theory, mass increases the closer one gets to the speed of light, necessitating more fuel, not less.
“Your are wrong because this is about achieving the speed of light, not acceleration over ground in a constant environment.”
I am talking about accelerating in space not over ground. I also did not mention the speed off light and any related boundaries(ie the increase in mass) which may be the reason you can’t get there. Merely correcting all of the wrong statements about the speed of the thrust etc. I talk about cutting engines and coasting as an example that yes the space ship can go faster than the speed of thrust which would be at zero.