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A bird is sitting on the top of a vertical pole 20 m high and its elevation from a point 'O' on the ground is 45^(@). It flies off horizontally straight away from the point 'O'. After one second, the elevation of the bird from 'O' is reduced to 30^(@). Then the speed (in m/s) of the bird is |
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Answer» `40( SQRT(2)-1)` |
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