2400 m/s is the arrival speed at the Moon according NASA.

"Arrival" is not a recognized technical term in astrodynamics. Please use appropriate terminology, and specify at what point along the orbit this "speed" occurs.

1500 m/s is the speed in orbit around the Moon according NASA.

The initial orbit after LOI-1 and before LOI-2 is elliptical, not circular. Please give more specific information about the orbit you envision the spacecraft to have entered.

Also, "according to NASA" is rhetorical nonsense, since the principles of orbital mechanics predate NASA by 100 years or more and are not dictated arbitrarily by them. The Apollo orbits are dictated by this century-old science and derived according to it. No need to try to accuse NASA at every turn.

43000 kg is the mass of the space ship at arrival according NASA.

Evidently it changes when fuel is consumed - but I keep it constant...

Then you did the problem spectacularly wrong. You cannot pretend using the wrong propulsion model will give you the right answer. The mathematical management of the variable-mass property of a space vehicle is what separates the real engineer from the incompetent amateur. A real engineer can derive the mass changes based on the known properties of the propulsion system, or the change in the dynamic state (accurately, including the change in mass) based on the known expenditure of propellant. The fact that you can do neither, and don't even try, indicates you don't know what you're doing. Your oversimplification is fatal to your claim.

Until you demonstrate even minimal competence, there is no point dissecting the rest of your "presentation" in depth.

as NASA cannot inform how much fuel or energy was consumed to reduce the speed from 2400 to 1500 m/s to get into orbit.

Factually false. Detailed pads for all burns have been available for more than 10 years. Someone so inept in his research does not enjoy

*a priori* credibility. You bear the burden to prove you have solved the problem correctly, and you frankly admit you have not. It is not the job of your critics to educate you properly in the correct principles of spacecraft dynamics. You have claimed to be an expert. You will either therefore demonstrate expertise to our satisfaction, or you will be dismissed.

FGS, just read my presentation where all info is given.

Your presentation is undocumented and proceeds from false premises and pretenses that I have outlined and asked you to correct here. Until those are corrected here, you have no reason to compel others to read a lengthy page of nonsense. Your egregious mistakes are made early enough on that the rest of your "presentation" is nonsense.