1.

An aeroplane is moving one kilometer high from west to east horizontally . From a point on the ground due south the angle of elevation of the aeroplane is 60^(@), and after 10 second, the angle of elevation of the aeroplane is observed as 30^(@) . Then the speed (in m/s)of the bird is

Answer»

`240sqrt(3)km//hr`
`485km//hr`
`364km//hr`
`523km//hr`

ANSWER :A


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