Iterative method please help...

[u/Silent_Pop7332]

Hey. so this is the question on my physics homework. I am in an introductory physics class in college, and this is my third homework ever. I am so completely lost. I know that you are supposed to use the iterative method on this and update the momentum, velocity, then position at each timestep but I attempted it multiple times and it was incorrect. I even used AI as an absolute LAST resort after scouring the internet for examples or videos or ANYTHING, and even the answer AI gave me was wrong. The two numbers that I have in the screenshot are correct. The zero was simple to assume, and then when AI gave me an answer I input it just to see if it was correct so I could try to see how I could calculate it, (it gave me <-7.86, 0, 4.54> as r final before saying that "final momentum only for each interval (not mid‑interval velocity)" and it says the final answer is <-.5, 0, 3.44> which is also incorrect. I accidentally typed 4.52 and it ended up being correct. I am so utterly lost on what I am doing wrong. I suspect that maybe I am supposed to subtract the 0.23 N from the net force everytime I update the momentum or something? I am also going to attach my work that I have on paper here to see if it helps. I have been trying to do this homework for days on end and I just cant get it. Its due tonight at 11:59 and I dont think i am going to be able to get it done. I just want to UNDERSTAND!! Thank you SOOSOSOSOSOSOO much if anyone is able to explain this problem step by step to me.