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At what speed will the velocity head of ...

At what speed will the velocity head of a stream of water be equal to 20 cm of mercury . Taking `(g=10ms^(-2))`.

A

`6.4 ms^(-1)`

B

`7.376 ms^(-6)`

C

`6.4756 ms^(-1)`

D

None of these

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The correct Answer is:
B
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