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A ball is dropped into a well. The water level in the well is at a depth 'h' below the top. If the speed of sound is V, then after what time the splash of sound is heard?

$\begin {array} {1 1} (1)\;h\bigg[ \sqrt{\large\frac{2}{gh}}- \large\frac{1}{v} \bigg] & \quad (2)\;h \bigg[ \large\frac{2}{g}+ \large\frac{1}{v}\bigg] \\ (3)\;h \bigg[ \large\frac{2}{g}- \large\frac{1}{v}\bigg] & \quad (4)\;h\bigg[ \sqrt{\large\frac{2}{gh}}+ \large\frac{1}{v} \bigg] \end {array}$

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(4) $h\bigg[ \sqrt{\large\frac{2}{gh}} + \large\frac{1}{v} \bigg]$
answered Nov 7, 2013 by pady_1

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