[" A bird is sitting on the top of a vertical "],[" pole "20m" high and its elevation from a "],[" point "0" on the ground is "45^(0)." It flies off "],[" horizontally straight away from the point "],[" O.After one second,the elevation of bird "],[" from "0" is reduced to "30^(@)," then the speed "],[" (in "m/s)" ,of the bird is "]

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

A bird is sitting on the top of a vertical pole 20 m high and its elevation from a point O on the the ground is 45 ^(@). If 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 :

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

A bird is sitting on the top of a vertical pole 20 m high and its elevations 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

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 45o . It flies off horizontally straight away from the point O. After one second, the elevation of the bird from O is reduced to 30o . Then the speed (in m/s) of the bird is (1) 40(sqrt(2)-1) (2) 40(sqrt(3)-2) (3) 20""sqrt(2) (4) 20(sqrt(3)-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 45o . It flies off horizontally straight away from the point O. After one second, the elevation of the bird from O is reduced to 30o . Then the speed (in m/s) of the bird is (1) 40(sqrt(2)-1) (2) 40(sqrt(3)-2) (3) 20""sqrt(2) (4) 20(sqrt(3)-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 45o . It flies off horizontally straight away from the point O. After one second, the elevation of the bird from O is reduced to 30o . Then the speed (in m/s) of the bird is (1) 40(sqrt(2)-1) (2) 40(sqrt(3)-2) (3) 20""sqrt(2) (4) 20(sqrt(3)-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 45o . It flies off horizontally straight away from the point O. After one second, the elevation of the bird from O is reduced to 30o . Then the speed (in m/s) of the bird is (1) 40(sqrt(2)-1) (2) 40(sqrt(3)-2) (3) 20""sqrt(2) (4) 20(sqrt(3)-1)