2D parabolic trajectory from height

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% Author: Izaak Neutelings (April 2021)
\documentclass[border=3pt,tikz]{standalone}
\usepackage{amsmath}
\usepackage{physics}
\usepackage{siunitx}
\usepackage{xcolor}
\usepackage{etoolbox} %ifthen
\usepackage[outline]{contour} % glow around text
\tikzset{>=latex} % for LaTeX arrow head
\usetikzlibrary{angles,quotes,arrows.meta} % for pic
\contourlength{1.0pt}
\colorlet{myblue}{blue!70!black}
\colorlet{mydarkblue}{blue!40!black}
\colorlet{mygreen}{green!50!black}
\colorlet{myred}{red!65!black}
\colorlet{xcol}{blue!85!black}
\colorlet{vcol}{green!70!black}
\colorlet{projcol}{vcol!90!black!60}
\tikzstyle{wave}=[myblue,thick]
\tikzstyle{xline}=[very thick,myblue]
\tikzstyle{vline}=[very thick,mygreen]
\tikzstyle{vector}=[->,very thick,vcol,line cap=round]
\tikzstyle{mydashed}=[green!30!black!90,dash pattern=on 2pt off 2pt,very thin]
\tikzstyle{mymeas}=[{Latex[length=3,width=2]}-{Latex[length=3,width=2]},thin]
\def\tick#1#2{\draw[thick] (#1) ++ (#2:0.05*\ymax) --++ (#2-180:0.1*\ymax)}
\begin{document}
% TRAJECTORY - PARABOLA
\def\xmax{3.8}
\def\ymax{2.4}
\def\v{1.0}
\def\ang{30}
\def\d{(0.9*\xmax)} % distance landing point
\def\b{tan(30)} % slope at x=0
\def\h{0.6*\ymax} % height h
\def\a{-((\b*\d+\h)/\d^2)} % coefficient
\def\nsamples{100}
 
 
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