The below figure shows a pipe with a circular cross section of diameter 5 cm on the left end and a square cross section with diagonal 5 cm on the right end. Water enters the left end with a velocity 20 m/s and leaves the right end with a velocity V2. Find V2 (neglect losses in the pipe).

(a) V2 cannot be found as the length of the pipe is not given

(b) V2 cannot be found as the intermediate cross sections are not given.

(c) 31.41 m/s

(d) 20 m/s

I got this question in a job interview.

My doubt stems from Introduction to Fluid Dynamics topic in section Fluid Dynamics of Fluid Mechanics