Alright, so the flat earth theory runs into some problems when it comes to gravity:
1. Gravity decreases as height increases. If the earth were accelerating in a linear path, this wouldn't happen.
2.If Earth accelerated at 9.81m/s², it reach the speed of light within one year. This hasn't happened(and don't tell me about weird space-time warping and stuff)
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To solve this, we have to forget the idea of the earth accelerating in a straight path and instead think of it going in a circle, with the surface towards the center. This way, a constant acceleration can occur without the earth actually speeding up.
Also, if the radius decreases(e.g. you climb a mountain) with the angular speed stays the same, acceleration decreases as well. We can also observe this on our earth.
To calculate the angular speed as well as the radius of the circle we are moving in, we can use some of the observed data: from sea level to 9000 gravity decreases by 0.29%. Now, with the formula a=ω²r we can create the equation:
ω²(r-9000)=(ω²r)-(0.0029*g)
If g is the standard gravity of 9.80665m/s², we can solve this for ω and we get the result:
ω≈0.0017762s⁻¹
If we use this in the equation a/ω²=r we can conclude that:
r≈3126859m=3126.859km
This post shows how when you solve some problems of a weird theory, others pop into existence...
Thank you for reading this and have a good day
MrQweep