Dude, I'm going into Engineering in University and took physics for two years in high school, I know what the acceleration due to gravity is and I know all of Newton's laws and I have a decent knowledge of physics probably more than you do since you called it "the gravity number" lol. Newton's third law is "for every action there is an equal and opposite reaction" and to be honest it doesn't even take a physics student to know that one.Don´t start dodging stuff now. First of all prove to me an airplane hit the Pentagon.
Then explain the hole (which apparently) was caused by the airplane.
Seeing as you took the gravity number from the internet perhaps you can find on google what Newton´s third law is.
Anyways back to the point: What do you think caused the hole in the building? From what I've cared to read people believe a missile hit the building or a bomb was planted there... How would either of those two things created the hole?