The water velocity through the channel. T:{s. y] {in metresfsecondL is modelled in this assessment using the following function: Trim. 1:} = (Eh - My - 362]- [a} {5 marks} Find the maximum velocity by doing the following: i} nd all the critical points of the function v{.r._ 3;]: ii} identifg,r the single critical point that is within the cross section area A depicted abm'e {includ ing.. possibly. on the boundary]. iii} show that this critical point is a local maximum using the Hessian determinant test. iv} evaluate the 1."alue of LI at this maximum