1.

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 away from the point O. After one second, the elevation of the bird from O is reduced to 30^@. Then the speed ( in m//s) of the bird is

Answer»

`14.64m//s`
`16.4m//w`
`12.64m//s`
`15.64m//s`

ANSWER :A


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