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 aaeroplane is 60^(@), and after 10 second, the angle ofelevtion of the aeroplane is observed as 30^(@),then the speed (in m//s) of the aeroplane is

Answer»

`240sqrt3km//hr`
`485km//hr`
`364km//hr`
`523 km//hr`

ANSWER :A


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