Energy conservation

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% Author: Izaak Neutelings (October 2020)
% Inspiration: https://tex.stackexchange.com/questions/25531/adding-underbrace-in-tikz
\documentclass[border=3pt,tikz]{standalone}
\usepackage{physics}
\usepackage{siunitx}
\usepackage{tikz}
\usetikzlibrary{calc}
\usetikzlibrary{angles,quotes} % for pic
\tikzset{>=latex} % for LaTeX arrow head
\colorlet{xcol}{blue!70!black}
\colorlet{vcol}{green!60!black}
\colorlet{myred}{red!65!black}
\colorlet{acol}{red!50!blue!80!black!80}
\tikzstyle{mass}=[line width=0.6,red!30!black,fill=red!40!black!10,rounded corners=1,
                  top color=red!40!black!20,bottom color=red!40!black!10,shading angle=20]
\tikzstyle{faded mass}=[dashed,line width=0.1,red!30!black!40,fill=red!40!black!10,rounded corners=1,
                        top color=red!40!black!10,bottom color=red!40!black!10,shading angle=20]
\tikzstyle{rope}=[brown!70!black,very thick,line cap=round]
\def\rope#1{ \draw[black,line width=1.4] #1; \draw[rope,line width=1.1] #1; }
\tikzstyle{force}=[->,myred,very thick,line cap=round]
\tikzstyle{velocity}=[->,vcol,very thick,line cap=round]
\tikzstyle{Fproj}=[force,myred!40]
\begin{document}
% SKI RAMP
\begin{tikzpicture}
  \def\H{2.2} % height start
  \def\h{0.8} % height final
  \def\L{3.6} % length
  \def\R{0.25} % ball radius
  \coordinate (L) at (0,\H);
  \coordinate (A) at (0.15*\L,\H);
  \coordinate (B) at (\L,\h);
  \draw[<->] (-0.16,0) --++ (0,\H) node[midway,left=-5,fill=white,inner sep=1] {$H$};
  \draw[<->] (\L+0.14,0) --++ (0,\h+0.01) node[midway,fill=white,inner sep=1] {$h$};
  \draw[thick,top color=orange!40!black!60,bottom color=orange!40!black!20,shading angle=-20]
    (L) -- (A) to[out=-70,in=-140] (B) |- (0,0) -- cycle; %,line cap=round
  %\draw[force] (M)++(140:0.7*\r) --++ (-\F,0) node[below=1,above left=-4] {$\vb{F}_\mathrm{c}$};
 
 
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