Collision & conservation of momentum

Colliding masses to illustrate conservation of momentum.

Edit and compile if you like:

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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
\usetikzlibrary{patterns}
\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{ground}=[preaction={fill,top color=blue!50!black!10,bottom color=blue!50!black!5,shading angle=20},
                    fill,pattern color=blue!20!black,pattern=north east lines,draw=none,minimum width=0.3,minimum height=0.6]
\tikzstyle{velocity}=[->,vcol,very thick,line cap=round]
\tikzset{
  pics/collision/.style={
    code={
      \draw[line width=0.5*#1,orange,fill=yellow]
        (0:0.20*#1) -- (30:0.06*#1) -- (50:0.25*#1) -- (80:0.10*#1) -- (105:0.32*#1) --
        (140:0.08*#1) -- (170:0.25*#1) -- (190:0.08*#1) -- (220:0.25*#1) --
        (250:0.08*#1) -- (270:0.24*#1) -- (300:0.08*#1) -- (320:0.25*#1) -- (340:0.09*#1) -- cycle;
  }},
  pics/collision/.default=1,
}
\begin{document}
% COLLISION 1D before
\def\w{0.8} % mass width
\def\h{0.5} % mass height
\def\v{0.7} % mass velocity
\def\L{4.6} % length
 
 
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