Calculating the size of a regular block

Let us assume geometry land is dimilar to earth with g=9.8m/s²
and let us neglect air resistace

For a body in free fall we can calculate the distance using:
s=0.5*gt²=4.9t²

I did a simple experiment in the editor to see that the cube falls 50 blockspaces in 2s

Thus, 50b =4.9×2²
thus b=0.392

So If my calculations are right, each standard size block must be 0 39 meters


NOTE: Different gamemodes accelerate at different rates. But since cube has the max acceleration I took measurements based on cube.
Because for a body under free fall acceleration cant exceed g