Inertial reference frame

Illustration of Galilean relativity between two inertial frame of references moving at a constant relative speed w.r.t. each other.

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% Author: Izaak Neutelings (September 2020)
\documentclass[border=3pt,tikz]{standalone}
\usepackage{amsmath}
\usepackage{tikz}
\usepackage{physics}
\usetikzlibrary{calc}
\usetikzlibrary{bending} % for arrow head angle
\usetikzlibrary{patterns}
\usetikzlibrary{decorations.pathmorphing} % for decorate random steps
\tikzset{>=latex} % for LaTeX arrow head
\usepackage{xcolor}
\colorlet{xcol}{blue!70!black}
\colorlet{vcol}{green!45!black}
\tikzstyle{vvec}=[->,very thick,vcol,line cap=round]
\tikzstyle{ground}=[preaction={fill,top color=black!10,bottom color=black!5,shading angle=20},
                    fill,pattern=north east lines,draw=none,minimum width=0.3,minimum height=0.6]
\tikzstyle{mass}=[line width=0.5,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]
\def\car{
  \draw[thick,rounded corners=2,orange!60!black,
        top color=orange!70!black!6,bottom color=orange!70!black!2,shading angle=10]
    (0,1.1*\CR) rectangle++ (\CW,\CH);
  \fill[black!20]
    (0.15*\CW,\CR) circle(\CR) (0.85*\CW,\CR) circle(\CR);
  \draw[black,fill=black!90,thin,even odd rule]
    (0.15*\CW,\CR) circle(\CR) circle(0.5*\CR)
    (0.85*\CW,\CR) circle(\CR) circle(0.5*\CR);
}
\begin{document}
% STATIONARY REFERENCE FRAME
\begin{tikzpicture}
  \def\r{0.06}    % mass radius
  \def\H{1.8}     % human height
  \def\CW{3.6}    % car width
  \def\CH{2.5}    % car height
  \def\CR{0.3}    % wheel radius
  \def\d{0.5*\CW} % car distance
 
 
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