2cm
5cm
8cm
15cm
Correct answer is B
Volume of water after 9 seconds = 5π×9=45πcm3
Volume of cylinder = πr2h
∴
\pi \times 3^2 \times h = 45\pi
\implies 9h = 45
h = 5 cm
(where h = height of the water after 9 secs)
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