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What did I miss here in this topic!
Obviously this...
My question,
How does the flat earth society determine this number 9.8ms2 without the mass of the Earth and radius of the Earth squared?
I think you can arrive at that figure by dropping a ball from a known height with a sufficiently accurate timer and doing a little math. Determining R acceleration due to gravity without determining the mechanism isn't a big ask.
And I said you only know how fast it falls with observation.
MODERN science knows why it falls.
Saying 9.8 ms is like saying the earth is round because it shows exactly the distance to the centre of the earth from the surface.