W pot = 1/2 * D * s^2            
         
Ableitung:

W pot = F * s               

                            F - s - Diagramm (Federkonstante)
  
                            F in N          D = konst. = F/s
                                |         x
                                |       x
                                |     x
                                |   x   W = 1/2*F*s (Fläche unter F-s)
                                | x
                                +----------- t in s
 
W pot = 1/2 * F * s         
    F = D * s

W pot = 1/2 * D * s * s
W pot = 1/2 * D * s^2

 Nm   =     N/m * m * m