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42. A tank is filled with water up to a height H. Water is allowed to come out of a hole P in one of the walls at a depth D below the surface of water. Express the horizontal distance x in terms of H and D

(a) x=√D(H-D)

(b) x=√[D(H-D)]/2

(c) x=2√D(H-D)

(d)  x=4√D(H-D)

Answer-c

(3)

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