1. The problem statement, all variables and given/known data Consider the surface, S, in the xyz-space with the parametric representation: S: (, ) = [cos() , sin() , ] −1/2 ≤ ≤ 1/2 0 ≤ ≤ os(). The surface is placed in a fluid with the velocity potential f of a flow: = y*^2 + z*^2 a) Find the velocity of the flow described by a vector field (, , ). b) What is the velocity at the point = (−1,5,0) 2. Relevant equations 3. The attempt at a solution so this is the solution given for a and b, however i don't understand the answer at b. How can the different equations just be summed into one number, i would understand it if was squared--> then taken the sum of the numbers --> then taken the squareroot. Can anyone confirmed that this solution is wrong?