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The angle of elevation of an aeroplane ...

The angle of elevation of an aeroplane from a point on the ground is `60^(@)` .After 15 seconds flight ,the elevation changes to `30^(@)` .If the aeroplane is flying at a height of `1500sqrt(3)` m , find the speed of the plane

A

600

B

`600(sqrt(3)+1)`

C

`600sqrt(3)`

D

`600(sqrt(3)-1)`

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The correct Answer is:
D
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