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  4. An aeroplane is horizontally 2 km above the ground is observed at an elevation 60°. If after 10 seconds the elevation from the same point is 60°, the distance travelled by the aeroplane is

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Q. An aeroplane is horizontally 2 km above the ground is observed at an elevation 60$^\circ$. If after 10 seconds the elevation from the same point is 60$^\circ$, the distance travelled by the aeroplane is

Solution:

Correct answer is (a) $2 ( \frac {\sqrt {3} \,1} {\sqrt {3}})km$