Day 43 covers this:
https://asafgartner.github.io/annotations_player/hmh.html#day043#833
In simplest case you do :
Snext = Sprev + dt*Vprev + 0.5*dt*dt*A
Vnext = Vprev + dt*A
where S is position, V is velocity and A is acceleration (gravity in your case) constant/vector and dt is delta time between frames.