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The angle of elevation of a jet plane fr...

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

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The correct Answer is:
200m/sec.
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