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A diver D is still under water ( mu = ...

A diver D is still under water `( mu = (4)/(3))` at a depth `d = 10 m`. A bird is diving along line AB at a constant velocity in air. When the bird is exactly above the diver he sees it at a height of 50 m from himself and velocity of the bird appears to be inclined at `45°` to the horizontal. At what distance from the diver the bird actually hits the water surface.

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