When the elevation of sun changes from 45 to 30 the shadow of a tower increases by 60m then the height of the tower is?

Correct Answer:

Description for Correct answer:

Let the height of the tower be h.

=> \( \Large h = \frac{60}{\sqrt{3}-1} = \frac{60 \left(\sqrt{3}+1\right) }{2} = 30 \left(\sqrt{3}+1\right) m \)

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11.

An aeroplane flying horizontally at a height of 3 Km, above the ground is observed at a certain point on earth to subtend an angle of 60°. After 15 sec flight, its angle of elevation is changed to 30°. The speed of the aeroplane (taking √3 = 1.732) is

• 230.63 m/sec

• 230.93 m/sec

• 235.85 m/sec

• 235.85 m/sec

B.

230.93 m/sec