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The flat bottom of cylinder tank is silv...

The flat bottom of cylinder tank is silvered and water `(mu=4/3)` is filled in the tank upto a height h. A small bird is hovering at a height 3h from the bottom of the tank. When a small hole is opened near the bottom of the tank, the water level falls at the rate of 1 cm/s. The bird will perceive that his velocity of image is 1/x cm/sec (in downward directions) where x is

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