Question

ICBSE 20030)
The angle of elevation of an aeroplane from a point on the ground is 45°.
After flying for 15 seconds, the elevation changes to 30°. If the aeroplane
is flying at a height of 2500 metres, find the speed of the aeroplano​

Answer 1

Answer:

Mistake : ans is C

a=3000tan45

∘

=3000 m;3000=(3000+d)tan30

∘

⟹d=3000(

3

−1) m

speed=

15

3000(

3

−1)

m/s=200(

3

−1)

5

18

km/hr=527.04

solution

Answer 2

Step-by-step explanation:

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