an aeroplane , flying horizontally 1000m above the ground, is observed at an angle of elevation 60° from a point on the ground. After a flight of 10 seconds the angle of elevation at the point of observation changes to 30°. Find the speed of the plane in m/s. (take: root3 = 1.732).
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Answer:
173.2 m/s
Step-by-step explanation:
1000/d+l = 1/√3
1000/l = √3
d+l/l = 4 , d = 3l = 3x1000/√3 = 1000√3
speed = 1000√3/10 = 100√3 = 173.2 m/s
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