the angle of elevation of a jet plane from a point on a ground has measure 60 .
After a flight of 30 second . The angle of elevation has measure 30 . If the jet plane is flying at a constant height of 4500√3 m , find the speed of jet plane .
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(Draw diagram based on gives conditions. mark E , D,C points down and A,B points up.)
Tan 60 = AD/ED
\sqrt3
3
= 1500\sqrt3
3
/ED
ED = 1500
Tan 30 = BC/EC
1/\sqrt3
3
= 1500√3/EC
DE = EC - ED
4500-1500
= 3000
PLANE TRAVELS 3000 m in 15 sec.
speed = Dstance/Time
= 3000/15
200 m/s.
Jet plane speed = 200m/s.
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