# 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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