Water at 20°C flows upward at 4 m/s in a 6-cm-diameter pipe, the pipe length between points

Question:

Water at 20°C flows upward at 4 m/s in a 6-cm-diameter pipe, the pipe length between points 1 and 2 is 5 m, and point 2 is 3 m higher. A mercury manometer, connected between 1 and 2, has a reading h = 135 mm, with p1 higher.
(a) What is the pressure change (p1 − p2)?
(b) What is the head loss, in meters?
(c) Is the manometer reading proportional to head loss? Explain.
(d) What is the friction factor of the flow?

Water at 20°C flows upward at 4 m/s