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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 45º. It flies off horizontally straight away from the point O. After one second, the elevation of the bird from O is reduced to 30º. Then the speed (in m/s) of the bird is :

1. 20( 3 – 1)
2. 40( 2 – 1)
3. 40( 3 – 2 )
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Correct answer: 20( 3 – 1)

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