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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 on the ground is 60°. After a flight of 15 seconds the angle of elevation changed to 30°. If the jet plane is flying at a constant height of 1500√3 m, find the speed of the jet plane.

    • Posted by @/<$#!T Just Own 4 years, 8 months ago

    CBSE > Class 10 > Mathematics
    • 2 answers

    Good Day 4 years, 8 months ago

    100 m/sec

    0Thank You

    Secret ??? 4 years, 8 months ago

    Let the position of jet changed from point j to j'. And height of it is j'c is 1500×3½ m. We know s=d/t, t=15, so we need to find distance travelled i.e. AC. In triangle J'CA, J'C/AC =tan30 (<J'CA=30°). 1500×3½/AC=1/3½................... AC =1500×3 =4500......... S =1500/15......... S=300ms-¹

    0Thank You

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