An aeroplane is flying horizontally at a height of 2000m. it's angel of elevation from a point on the ground changes from 60degree to 30degree in 20sec flying. find the speed of the aeroplane. #no spam plzz
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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. please make me brain list and like it
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