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The angle of elevation of a …

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The angle of elevation of a jet plane from a point A an the ground is 60°. After a flight of 15 seconds the angle of elevation changes to 30°. If the jet plane is flying at a constant height of m find the speed of the jet plane.

    • Posted by Vaibhav Prajapati 6 years, 11 months ago

    CBSE > Class 10 > Mathematics
    • 2 answers

    Gaurav Seth 6 years, 11 months ago

     (Draw diagram based on gives conditions. mark E , D,C  points down and A,B points up.)

    Tan 60 = AD/ED

     = 1500/ED

    ED = 1500

    Tan 30 = BC/EC

    1/ = 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.

    0Thank You

    Ravi Yadav 6 years, 11 months ago

    This ch 9 yes So speed find in plane in tan30 'tan 60 So your answer in give you

    0Thank You

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