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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 20 seconds at the speed of 432 `km//"hour"`, the angle of elevation changes to `30^@`. If the jet plane is flying at a constant height, then its height is :

A

`1800sqrt3` m

B

`3600sqrt3` m

C

`2400sqrt3` m

D

`1200sqrt3`

Text Solution

Verified by Experts

The correct Answer is:
D
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Knowledge Check

  • The angle of elevation of an airplane from a point on the ground is 60^(@) . After a flight of 30 seconds, the angle of elevation becomes 30^(@) . If the airplane is flying at a constant height of 3000sqrt(3) m, find the speed of the airplane.

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