Jumping in 2D java game

Question

Im having trouble with managing jumping and gravity in a 2D game. Whats is the most basic formula I can use so I create a code around it? The kind of jumping im looking for resembles that of the mario NES games

Answer 1

time of going up must be equal to time of getting down
//in physics (ideal conditions) t=u/g
//where u is vel. in dirn opp. to gravity(in ms^-1) & g=9.8ms^-2[units of same system]
//h will be u^2/2g
//but in real world , this formula fails for calculating exact value ... for game also , u must not use that ... ur wish☺

Answer 2

Use momentum.
When you jump, momentum goes up.
Gravity brings it down slightly every tick unless on ground or terminal velocity. Maybe by multiplication and momentum being a float or double.