- Jun 22, 2015
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Last time I checked, gravity is STILL only a theory.This is a figure for the Earth, where the mass being dropped is microscopic compared to the Earth, so that the gravitational effect on the Earth can be safely neglected.
No, you've gotten the physics wildly wrong there. If m is the mass of a dropped object, M is the mass of the Earth, G is the gravitational constant, and r is the radius of the Earth, then for an object dropped close to the surface,
F = ma = GmM/r^2
So that (cancelling the m's), the acceleration a = GM/r^2 = 9.8.
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