I won't even write it delta T up is the same thing as our total time in the air our total time in the air, divided by two and so we get we get, negative the initial velocity, is equal to this thing divided be two is going to be four point nine meters per second square we still have our negative out in front times our delta T, times our delta T, and remember this is our total time in the air, not just the time up, this is our total time in the air and then we multiply both sides times the negative and we get our initial velocity, is just going to be equal to four point nine, four point nine meters per second square times the total time, the total time that we are in the air, or you could say, the or you could say it's the, it's going to be nine point eight meters per second square times half of the time that we're in the air, either of those will get you the same calculation, so lets figure out our total distance, or the distance that we travel in that first in the time of, so that will give us the peek distance, remember that distance or should i say displacement in this situation, displacement is equal to average velocity, average velocity times the change in time, the change in time that we care about is the time of, so that is our delta T over two, our total time our total time divided by two, this is our, this is our time of time of, and whats our average velocity? well the average velocity if we assume constant acceleration is your initial velocity plus your final velocity over two, its really just the mean of the two things. well we know what our initial velocity is our initial velocity is this thing over here, so this thing is this thing over here, our final velocity, remember we're just talking about the first half of the time the ball's in the air so it's final velocity is zero we're talking when it gets to this peak point over here its from two videos ago, that peak point right over there, so our average velocity is just going to be, our average velocity is just going to be, this stuff divided by two so it's going to be four point nine meters per second square, times delta T times delta T over, over two, so this right here this is our average velocity velocity average so lets stick that back over here so our maximum displacement our maximum displacement is going to be our average velocity, so that is going to be four point nine meters per second square times delta T, times delta T, all of that over two and then we multiply that again times the total times the time of, so times delta T over two again, this is the same thing, and these are the same thing and then we can simplify it, our maximum displacement is equal to four point nine meters per second squared times delta T squared, times delta T squared all of that over, all of that over four and then we can just divide four point nine divided by four, four point nine divided by four is, what is it, it's one point one point two, one point two, two, five I believe, let me just get my calculator out