It is from I.G Currie's "Fundamental mechanics of fluids" 4th edition. (Problem 7.

Please look at the attached problem. It is from I.G Currie's "Fundamental mechanics of fluids" 4th edition. (Problem 7.4).  If you have solution to this book's Chapter 7 (or even better if you also have for other chapters) please feel free to send it to me as answer to the problem. I can provide tips if you have that.