(0.5u2 h)N\left(\frac{0.5 \mathrm{u}^{2}}{\mathrm{~h}}\right) \mathrm{N}( h0.5u2)N
(0.25u2 h)N\left(\frac{0.25 \mathrm{u}^{2}}{\mathrm{~h}}\right) \mathrm{N}( h0.25u2)N
(0.25uh)N\left(\frac{0.25 \mathrm{u}}{\mathrm{h}}\right) \mathrm{N}(h0.25u)N
(0.05u2 h)N\left(\frac{0.05 \mathrm{u}^{2}}{\mathrm{~h}}\right) \mathrm{N}( h0.05u2)N