<em>Motion graphs! Oh yes, I remember those. </em>
<em>I will be using the example of a remote-control car.</em>
<em />
<em>For Section AB:</em>
<em>The car starts moving steadily in one direction.</em>
<em>For Section BC:</em>
<em>The car has stopped moving.</em>
<em>And finally, for section CD:</em>
<em>The car has turned around and returned to the starting point at a steady pace.</em>
<em />
<em>I hope this answers your question.</em>
<em>-Toremi</em>