The Attempt at a Solution
I don't understand which concept to apply in this question . The hint says to apply Bernoulli's equation and uses ∆P (excess pressure ) = (1/2) ρ v2 . This does give right answer .
But I think this is wrong . We cannot apply Bernoulli's equation as it will not be a steady flow .
What is the relevant principle to be applied in this problem ?
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