A bird is sitting on the top of a vertical pole 20m high and its elevation from a point O n the ground is 45^o. It flies off horizontally straight away from the point O. After 1s, the elevation of the bird from O is reduced to 30^o. Then, the speed (in m/s of the bird is

( $40 square root of 2 minus end root space 1$

$40 left parenthesis square root of 3 space space end root space minus space square root of 2 right parenthesis$
$20 space square root of 2$
$20 left parenthesis square root of 3 minus 1 end root right parenthesis$

Solution

20 left parenthesis square root of 3 minus 1 end root right parenthesis

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