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An aeroplane flying horizontally 1 km ab...

An aeroplane flying horizontally 1 km above the ground is observed at an elevation of `60^(@)`. After a flight of 10 seconds, its angle of elevation is observed to be `30^(@)` from the same point on the ground. Find the speed of the aeroplane.

A

`415.7 km//h`

B

`215.3 km//h`

C

`700 km//h`

D

none of the above

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VGS PUBLICATION-BRILLIANT-APPLICATIONS OF TRIGONOMETRY-EXERCISE
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  4. When the angle of elevation of a pole is 45^(@), the length of the pol...

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  8. A building casts a shadow of length 50sqrt(3) m when the sun is 30^(@)...

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  9. When the angle of elevation of a light changes from 30^(@)" to "45^(@)...

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  10. From the top of a building 50m from horizontal, the angle of depressi...

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  14. A tree breaks due to storm and the broken part bends so that the top o...

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  15. The angle of elevation of a cloud from a point 200 m above the lake is...

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  16. An aeroplane flying horizontally 1 km above the ground is observed at ...

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  17. If AB=4m, and AC=8m, then the angle of elevation of A as observed from...

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  18. If a pole height 6m casts a shadow 2sqrt(3)m long on the ground, then ...

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  19. Find the elevation of the sun at the moment when the length of the sha...

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  20. If the shadow of a tree is (1)/(sqrt(3)) times the height of the tree,...

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