A diver D is still under water 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 (in m ) from the diver the bird actually hits the water surface.
is the true angle that the line of motion of the bird makes with horizontal.
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