A water hose 4cm in diameter is used to fill a 30 lit bucket . If it takes 2 minutes to fill the bucket , then the speed V at which the water leaves the hose is

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4 cm/s

52.6 cm/s

70 cm/s

19.8 cm /s

answer is D.

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Detailed Solution

Vt=Aυ⇒Vt=πr2υ⇒υ=30×103×72×60×4×22=19.8cms−1

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