<?xml version="1.0" encoding="UTF-8" standalone="no"?><Modellus><Main AutoPlay="1" DecimalPlaces="2" Degrees="0" Independent="t" Max="50.0" Min="0.0" Password="" Protected="0" ShowCases="0" Step="0.1"/><Editor Height="230" LocationX="0" LocationY="0" Minimized="0" Width="372"><Line Text="x=2 t^2"/><Line Text="slope=delta_x/delta_t"/><Line Text="derivative=4 t"/></Editor><Animator ShowGrid="0"><Grid Spacing="1"><Color Alpha="255" Blue="192" Green="192" Red="192"/></Grid><pen AttachedTo="" Auto-Scale="0" BoundsHeight="20" BoundsWidth="20" BoundsX="-10" BoundsY="-10" Case="0" IsNameVisible="0" IsPenVisible="1" LeaveAMarkEvery="10" LocationX="340.0" LocationY="163.0" Name="Pen 1" PositionXValue="0.0" PositionYValue="0.0" ShowAxes="1" ShowName="1" ShowProjectionLines="1" ShowStroboscopy="0" ShowTrajectory="1" ShowValue="1" StrokeType="0" StrokeWidth="1.0" WriteEnabled="0" XScale="5.0" YScale="0.02"><Background Alpha="255" Blue="232" Green="194" Red="83"/><Foreground Alpha="255" Blue="232" Green="194" Red="83"/><PositionX IsFixed="0" IsNumber="0" Name="t" Situation="0" Value="0.0"/><PositionY IsFixed="0" IsNumber="0" Name="x" Situation="0" Value="0.0"/></pen><geometricObject AttachedTo="" Auto-Scale="0" BoundsHeight="10" BoundsWidth="10" BoundsX="-5" BoundsY="-5" Case="0" IsNameVisible="0" LeaveAMarkEvery="10" LocationX="460.0" LocationY="180.0" Name="Geometric Object 1" PositionXValue="90.0" PositionYValue="50.0" ShowAxes="1" ShowName="1" ShowProjectionLines="1" ShowStroboscopy="0" ShowTrajectory="0" ShowValue="1" Thickness="1.0" XScale="5.0" YScale="0.02"><Foreground Alpha="255" Blue="64" Green="64" Red="64"/><PositionX IsFixed="0" IsNumber="0" Name="delta_t" Situation="0" Value="18.0"/><PositionY IsFixed="0" IsNumber="0" Name="delta_x" Situation="0" Value="2500.0"/><Type FirstX="460.0" FirstY="387.0" Name="Line Segment" SecondX="550.0" SecondY="337.0"/></geometricObject><variable AttachedTo="" Auto-Scale="0" BoundsHeight="25" BoundsWidth="165" BoundsX="-82" BoundsY="-12" Case="0" IsNameVisible="0" LeaveAMarkEvery="10" LocationX="57.0" LocationY="208.0" Name="Variable 1" PositionXValue="82.0" PositionYValue="28.0" ShowAxes="0" ShowName="1" ShowProjectionLines="0" ShowStroboscopy="0" ShowTrajectory="0" ShowValue="1" XScale="1.0" YScale="1.0"><Foreground Alpha="255" Blue="64" Green="64" Red="64"/><PositionX IsFixed="0" IsNumber="1" Name="" Situation="0" Value="82.0"/><PositionY IsFixed="0" IsNumber="1" Name="" Situation="0" Value="28.0"/><Value IsFixed="0" IsNumber="0" Name="slope" Situation="0" Value="138.88888888888889"/></variable><variable AttachedTo="" Auto-Scale="0" BoundsHeight="24" BoundsWidth="181" BoundsX="-90" BoundsY="-12" Case="0" IsNameVisible="0" LeaveAMarkEvery="10" LocationX="53.0" LocationY="153.0" Name="Variable 2" PositionXValue="90.0" PositionYValue="28.0" ShowAxes="0" ShowName="1" ShowProjectionLines="0" ShowStroboscopy="0" ShowTrajectory="0" ShowValue="1" XScale="1.0" YScale="1.0"><Foreground Alpha="255" Blue="64" Green="64" Red="64"/><PositionX IsFixed="0" IsNumber="1" Name="" Situation="0" Value="90.0"/><PositionY IsFixed="0" IsNumber="1" Name="" Situation="0" Value="28.0"/><Value IsFixed="0" IsNumber="0" Name="derivative" Situation="0" Value="0.0"/></variable></Animator><Notes Height="150" LocationX="0" LocationY="320" Minimized="1" Text="{\rtf1\ansi&#10;{\fonttbl\f0\fnil Monospaced;\f1\fnil Tahoma;}&#10;{\colortbl\red0\green0\blue0;\red15\green20\blue25;\red14\green19\blue24;}&#10;&#10;\li0\ri0\fi0\f1\fs24\i0\b0\ul0\cf2\par&#10;\cf1\par&#10;\par&#10;\ul0\par&#10;}&#10;" Width="300"/><Chart AutoScale="1" AxisValues="1" EqualScales="0" Height="300" LocationX="507" LocationY="0" MaximumX="45.5" MaximumY="45.5" Minimized="1" MinimumX="0.0" MinimumY="0.0" Points="0" ProjectionLines="1" TangentLines="0" Thickness="1" Values="1" Width="300"><Horizontal IsFixed="0" IsNumber="0" Name="t" Situation="0" Value="0.0"/><Terms><Vertical1 IsFixed="0" IsNumber="0" Name="x" Situation="0" Value="0.0"/><Color1 Alpha="255" Blue="64" Green="64" Red="64"/><Vertical2 IsFixed="0" IsNumber="1" Name="" Situation="0" Value="NaN"/><Color2 Alpha="255" Blue="64" Green="64" Red="64"/><Vertical3 IsFixed="0" IsNumber="1" Name="" Situation="0" Value="NaN"/><Color3 Alpha="255" Blue="64" Green="64" Red="64"/><Vertical4 IsFixed="0" IsNumber="1" Name="" Situation="0" Value="NaN"/><Color4 Alpha="255" Blue="64" Green="64" Red="64"/><Vertical5 IsFixed="0" IsNumber="1" Name="" Situation="0" Value="NaN"/><Color5 Alpha="255" Blue="64" Green="64" Red="64"/></Terms></Chart><Table Height="300" LocationX="809" LocationY="0" Minimized="0" ShowBars="0" Steps="1" Width="200"><Terms><Variable1 IsFixed="0" IsNumber="0" Name="t" Situation="0" Value="0.0"/><Color1 Alpha="255" Blue="64" Green="64" Red="64"/><Variable2 IsFixed="0" IsNumber="0" Name="x" Situation="0" Value="0.0"/><Color2 Alpha="255" Blue="64" Green="64" Red="64"/><Variable3 IsFixed="0" IsNumber="1" Name="" Situation="0" Value="NaN"/><Color3 Alpha="255" Blue="64" Green="64" Red="64"/><Variable4 IsFixed="0" IsNumber="1" Name="" Situation="0" Value="NaN"/><Color4 Alpha="255" Blue="64" Green="64" Red="64"/><Variable5 IsFixed="0" IsNumber="1" Name="" Situation="0" Value="NaN"/><Color5 Alpha="255" Blue="64" Green="64" Red="64"/><Variable6 IsFixed="0" IsNumber="1" Name="" Situation="0" Value="NaN"/><Color6 Alpha="255" Blue="64" Green="64" Red="64"/><Variable7 IsFixed="0" IsNumber="1" Name="" Situation="0" Value="NaN"/><Color7 Alpha="255" Blue="64" Green="64" Red="64"/><Variable8 IsFixed="0" IsNumber="1" Name="" Situation="0" Value="NaN"/><Color8 Alpha="255" Blue="64" Green="64" Red="64"/><Variable9 IsFixed="0" IsNumber="1" Name="" Situation="0" Value="NaN"/><Color9 Alpha="255" Blue="64" Green="64" Red="64"/><Variable10 IsFixed="0" IsNumber="1" Name="" Situation="0" Value="NaN"/><Color10 Alpha="255" Blue="64" Green="64" Red="64"/></Terms></Table><Data><Parameters><Term EqualAllCases="0" Name="delta_x"><Situation Value="2500.0"/><Situation Value="0.0"/><Situation Value="0.0"/><Situation Value="0.0"/><Situation Value="0.0"/><Situation Value="0.0"/><Situation Value="0.0"/><Situation Value="0.0"/><Situation Value="0.0"/><Situation Value="0.0"/></Term><Term EqualAllCases="0" Name="delta_t"><Situation Value="18.0"/><Situation Value="0.0"/><Situation Value="0.0"/><Situation Value="0.0"/><Situation Value="0.0"/><Situation Value="0.0"/><Situation Value="0.0"/><Situation Value="0.0"/><Situation Value="0.0"/><Situation Value="0.0"/></Term></Parameters><InitialConditions/></Data></Modellus>