Implementing gravity in simple 2d game

Question

I\'m making a simple game, something like mario, with a character fixed in one position, and the ground moving left, giving the illusion of character movement. The ground is

Answer 1

Let's see:

g = 9.8 meters/second

Take height of your character in pixels and match it to an average man height, say 1.7 meters tall.

Then use gravitation formula:

y = y0 - g * t^2 / 2

where g is in pixels/second.