1. Tardigrade
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  3. Mathematics
  4. A bird is sitting on the top of a vertical pole 20 m high and its elevation from a point O the ground is '45°' It 'flies' off horizontally straight a Way from 1 the point O. After one second, the elevation of,the bird from O is reduced to 30°. Then the 'speed' (m m/s) of the bird is

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Q. A bird is sitting on the top of a vertical pole 20 m high and its elevation from a point O the ground is '45$\circ$' It 'flies' off horizontally straight a Way from 1 the point O. After one second, the elevation of,the bird from O is reduced to 30$^\circ$. Then the 'speed' (m m/s) of the bird is

Solution:

Correct answer is (b) $20 (\sqrt {3}-1)$