code: private void updateNotArrivedV(double extrp)
      {
          if (fv < fvDest)
          {
              fv += velocity * extrp;
              if (fv > fvDest - sensibility)
              {
                  fv = fvDest;
                  arrivedV = true;
              }
          }
          else if (fv > fvDest)
          {
              fv -= velocity * extrp;
              if (fv < fvDest + sensibility)
              {
                  fv = fvDest;
                  arrivedV = true;
              }
          }
      }
docs: Update the force if still not reached on vertical axis.
  
  @param extrp The extrapolation value.