Projectile motion using while loop Time of flight

So i need a program that tells you when a potato launcher will hit a target.... (can change this variable and still work). initial variables vx=200, vy,x,y=0 dtarg=23 delta_t=.01seconds.I've checked all the forum information and am still not able to get mine to run correctly. our inputs for (delt_x=vx*delta_t) (delta_y=vy*delta_t) (delta_vx=(-.0254)*(v^x)^2) delta_vy=-(9.8)*delta_t. Like i said we're looking for time of impact and to a set target distance(dtarg). I am not sure what I am missing to make my code work. Any help is grately appreciated.

clc
clear all
  
      dt=0.01; %s
      i=1;
      x=0;
      y=0;
      delta_x=0;
      delta_y=0;
      g=-9.81;
      vx=200
      vy=0
      delta_vx=0;
      delta_vy=0;
      Dtarget=15;
      
      while x<=Dtarget 
    delta_vy(i)=-(9.81)*dt  
    delta_vx(i)=(-.0254)*(vx^2)*dt
    
    delta_x(i)=vx*dt
    delta_y(i)=vy*dt
    
    i=i+1;
    
      end

Answer 1

[Sindar]

Basically, the issue is that you are only updating a small portion of the relevant variables each time step. A few questions

• Is delt_x your current position, or the change in position from your last time step?
• Should x, y, vx & vy be constant? They are in your code

[dotty daniels]

Sorry I did get it. I had way too many variables and was making it way more complex than i should have been. Thank you very much