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Standard ZDoom units
velocity – mapunits per tic
acceleration – mapunits per tic^2
gravity – as acceleration
Gravity is defined by free fall acceleration, and is measured using the same units as normal acceleration.
These units should be converted to standard units before performing any operations with them.
meters, feet, and other nonsense – Doom doesn't have an accurate scale
sv_gravity units (800:1) – converted to acceleration by dividing by 800