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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 |
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Answer» `240sqrt3km//hr` |
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