After 1 second of falling from a standstill, a typical gravity 1.0 actor will be falling at a speed of 35 units per tic.

This translates to 35x35 units per second - 1225.

On Earth, ignoring air resistance, an object after falling one second will be falling at a speed of 9.8 metres per second.

If we suppose Doomguy's 56 units to be a little less than 2m, we can rough out 60 units to be 2m - or 30 units as 1m.*

This means that if Doom's gravity were made similar to IRL, after 1 second of falling a gravity 1.0 actor would be going at 30x9.8 units per second - 294.

Am I missing something? Is Doom's gravitation acceleration really up to four times what we see in real life!?

*(The current dev version of HD sets this at 37 but that's only because it emphasizes horizontal distances and multiplies the relevant formula by 1.2 while also presupposing a much shorter doomguy.)