alleryVelocity of efflux from small hole at depth h below free surface (Torricelli's law):
Av = gh
Bv = sqrt(2gh)
Cv = 2gh
Dv = sqrt(gh)
Answer & Solution
Correct answer: B. v = sqrt(2gh)
From Bernoulli (P_atm both sides, neglect surface motion): (1/2)v² = gh → v = sqrt(2gh).
Same speed as free fall from height h.
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