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A hole is made at the bottom of a large ...

A hole is made at the bottom of a large vessel open at the top. If water is filled to a height h it drain out completely in time t. The time taken by the water column of height 2h to drain completely is
(a). `sqrt(2t)`
(b). `2t`
(c). `2sqrt(2t)`
(d). `4t`

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