A snake observes an eagle perching on the top of a pole 20 m high. Its elevation from snake s eye is `45^@` before it hies off horizontally straight away from the snake and after one second the elevation of the eagle reduces to `30^@`.The speed of the eagle 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 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 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)