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Q.

Water is moving with a speed of 5.18 ms-1 through a pipe with a cross-sectional area of 4.20 cm2. The water gradually descends 9.66 m as the cross-sectional area of pipe is increased to 7.60 cm2. The speed of the flow of water at lower level is

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a

2.86 ms-1

b

3.0 ms-1

c

3.82 ms-1

d

5.7 ms-1

answer is A.

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Detailed Solution

From the principle of continuity,   A1v1=A2v2⇒ v2=A1v1A2=4.20×5.187.60=2.86ms−1
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