A firehouse must be able to shoot water to the top of a building 35.0 m tall

Question:

A firehouse must be able to shoot water to the top of a building 35.0 m tall when aimed straight up. Water enters this hose at a steady rate of 0.500 m'/s and shoots out of a round nozzle.
(a) What is the maximum diameter this nozzle can have?
(b) If the only nozzle available has a diameter twice as great, what is the highest point the water can reach?