[martinced]

There are several ways to do "game gravity right" and not just one answer.

For example some games have entirely reproducible game states which depends on only two things: the seed given to the PRNG and the inputs made the player (and the time at which they happened).

There are a lot of games (probably most of them) which have gravity but which aren't "real" physics simulation and/or which do definitely not need a "real" physics simulation to be, well, fun games.

Some of them do simply use integer-math and precomputed "gravity lookup tables" entirely consisting of integers. You then use the time elapsed to know where you should look in your table and you can of course compute a value "between two lookup indices".

The advantage of integer math (either using gravity lookup table or not), compared to floating-point math, is that your game engine can stay deterministic even if the floating-point numbers implementation vary from one platform / virtual machine to the other.