Let's see it again in two dimensions.


  f[t_]:={t^2,t}


  v[t_]:=f'[t]
  v[t]


  
  Clear[motion,tang,unittang]
  motion=ParametricPlot[f[t],{t,-3,3}];


  tang=vectorPlot[Table[f[i],{i,-3,3}],Table[f'[i]+f[i],{i,-3,3}]];


  Show[motion,tang,AspectRatio->Automatic];


  T[t_]:=f'[t]/Sqrt[f'[t].f'[t]]
  T[t]


  unittang=vectorPlot[Table[f[i],{i,-3,3}],Table[T[i]+f[i],{i,-3,3}]];


  Show[motion, unittang,AspectRatio->Automatic];

Up to Velocity and Acceleration