JEE Main 2014 Question Paper

Section: Mathematics

Question : 36 of 90

Marks: +1, -0

A bird sitting on the top of a vertical pole 20 m high and its elevation from point O on the ground is 45°.It files 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

[Main 2014]

40(√2−1)
40(√3−√2)
20√2
20(√3−1)

Validate

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