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»

`40( SQRT(2)-1)`
`40( sqrt(3)-sqrt(2))`
`20 sqrt(2)`
`20(sqrt(3)-1)`

Answer :D


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