Question: A firefighter on a ladder 25 m above ground should be able to spray water an additional 10 m up with the hose nozzle of

A firefighter on a ladder 25 m above ground should be able to spray water an additional 10 m up with the hose nozzle of exit diameter 2.5 cm. Assume a water pump on the ground and a reversible flow (hose, nozzle included) and find the minimum required power.

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