Sorry by piggybacking over your original post, but as far as I read, everything on FE accelerates upwards. This includes "everything" in reference to the ground, atmosphere, the Sun, Moon, stars, no matter the altitude to sea level. Considering everything goes upwards at the same acceleration rate, there is no difference on the nominal acceleration based on altitude to sea level. Imagine a high altitude balloon, sit on some atmospheric gases at 50km of altitude. The balloon is sit quietly there because it is being pushed upwards at the same acceleration imposed to the trash can at my backyard.

Using well known, measured, tested and used for decades formula, the ER gravity at 50km above sea level would use the formula g1/g2 = (R2/R1)², where R is the radius of the planet where the gravity g1 or g2 is measured. So, consider g1 = gravity at sea level and Radius of Earth on equator to be 6400km, then 9.8/g2 = (6450/6400)² = 9.8/g2 = 1.0078125² = g2 = 9.8/1.015686035, result g2 = 9.648m/s² (at 50km of altitude over equator). That means a reduction of gravity in the order of 1.5%, or, 0.153m/s². Using a second formula that calculates Height (of fall) for a specific time and gravity, h=t²*g/2, we can find a mass can fall through 50.067km in just 809 seconds (not considering air friction), final velocity of 445.6km/h. What all this means? That balloon at 50km of altitude, with acceleration of only 9.648m/s², less than the earth itself, would comes down and eventually hit the ground in 809 seconds. Of course that for several reasons the balloon will not splat on ground, but with different acceleration reates the balloon will not stay at 50km of altitude, it would be at much lower altitude trying to compensate the differences of acceleration and pressures differences between the atmosphere and balloon. Eventually it would touch ground, since speed differences don't forgive.

So, the only way to consider this possibility on FE, is if upwards acceleration is constant 9.8m/s² at any altitude, what was already proven otherwise. A 10kg solid metal mass at sea level will weight only 9.988km (12g less) at La Paz (Bolivia) 3640m above sea level, using the same precise scale, this proves without questions the gravity changes by altitude.

This test can be repeated, exercised, duplicated inside airplanes, top of mountains, etc. As a reference, such 10kg solid metal mass at sea level would weight only 9.968km, 32g less, inside an airplane flying steady at 10km of altitude over equator. FErs can do this test anytime.

I am here considering a very linear gravity acceleration over the whole planet, what is not. Several precise measurements were made using special satellites for that (NASA Grace (twin), and European GOCE), and found changes all over the globe, due different mass densities.

But wait... there is something here, I was wrong. It is not everything that accelerates at 9.8m/s² on FE world. We don't. My chair doesn't. My trash can doesn't. Only the earth does that, only the flat planet does that and pushes everything along. Everything else is just sit on top of it. No matter how dip I dig a hole and remove dirt and rocks, they don't accelerate, they still sit over the land. I can go into very dip caves and find rocks on the floor of the caves, what means what accelerate upward on FE world is the very very deep base. Even the volcanos's lava doesn't float in space, they sit and runs down the mountain's surface, it means, not even molten lava is being accelerated upward by this strange force. So, someone care for explain?