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Mathematics · 2014
JEE Main 2014 · 2014-04-06 Offline · Q89
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…
A bird is sitting on the top of a vertical pole $\displaystyle 20$ m high and its elevation from a point O on the ground is $\displaystyle 45$°. It flies off horizontally straight away from the point O. After one second, the elevation of the bird from O is reduced to $\displaystyle 30$°. Then the speed (in m/s) of the bird is :
Official answer
(2)
$\displaystyle 20(\sqrt{3}-1)$
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JEE Main 2014 Mathematics question, with the answer from NTA’s final answer key. Where our answers come from.