angle of elevation of an aeroplane from a point The angle of elevation of an aeroplane on the ground is 60 . after a flight of 15 seconds horizontally, the angle of elevation changes to 30 . if the aeroplane is flying at a speed of 200 m per sec , then find the constant height at which the aeroplane is flying. NOT FOR SPAMMERS!!!!!
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Answered by
3
Answer:
ANSWER
Height of aeroplane =BD=CE=1500¶3
m and
∠BAE=60
0
and CAE=30
0
In triangle ADB
tan60
0
=
AD
1500
3
⇒
3
=
AD
1500
3
⇒AD=1500 m
In triangle CAE
tan30
0
=
AE
1500
3
⇒
3
1
=
AD
1500
3
⇒AE=1500×3=4500 m
Distance covered by plane in 15 seconds: BC=DE=AE−AD=4500−1500=3000 m
Speed of aeroplane =
15
3000
=200 m/s=720 km/hr
Answered by
3
Answer:
Your answer is :-
Explanation:
720 km/hr.
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