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A wide vessel with small hole in the bottom is filled with water and kerosene. Neglecting viscosity, the velocity of water flow \( v \), if the thickness of water layer is \( h_{1} \) and that of kerosene layer is \( h_{2} \), is: (density of water \( \rho_{1} \mathrm{gm} / \mathrm{cc} \) and that of kerosene is \( \rho_{2} \mathrm{gm} / \mathrm{cc} \).)
(a) \( v=\sqrt{2 g\left(h_{1}+h_{2}\right)} \)
(b) \( v=\sqrt{2 g\left(h_{1} \rho_{1}+h_{2} \rho_{2}\right)} \)
(c) \( v=\sqrt{2 g\left[h_{1}+h_{2}\left(\frac{\rho_{2}}{\rho_{1}}\right)\right]} \)
(d) \( v=\sqrt{2 g\left[h_{1}\left(\frac{\rho_{1}}{\rho_{2}}\right)+h_{2}\right]} \)
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