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A manometer connected to a closed tap re...

A manometer connected to a closed tap reads `4.5 xx 10^5` Pa. When the tap is opened, the reading of the manometer falls to` 4 × 10^ 5` pascal. Then the velocity of flow of water is

A

a)`7 m s^-1`

B

b)`8 m s^-1`

C

c)`9 m s-1`

D

d)`10 m s^-1`

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The correct Answer is:
D
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