/usr/share/gravit/spawn/physics.lua is in gravit-data 0.5.1+dfsg-2.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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-- ------------------------------------
-- physics-related functions
-- ------------------------------------
-- !!! needs loaded "constants.lua" and "functions.lua"
-- compute velocity for stable orbit 
function orbit_velocity(innermass, disttocenter)
	local result = 0.0
	if math.abs(disttocenter) > 0.1 then
		result= math.sqrt(gravit_g * math.abs(innermass) / math.abs(disttocenter))
	end
	if gravit_physics < PH_PROPER then
	        result=result*math.sqrt(math.abs(disttocenter))
	end
	return result
end
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