JEE-Mains 2014 (29/30)

Geometry Level 2

A bird is sitting on the top of a vertical pole \(20 \text{ m}\) high and its elevation from a point \(O\) on the ground is \(45^{\circ}\). If flies off horizontally straight away from the point \(O\). After one second, the elevation of the bird from \(O\) is reduced to \(30^{\circ}\). Then the speed (in m/s) of the bird is :

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