Heights and Distances ( Part 5) Some Applications of Trigonometry | CBSE | Class 10 | Math
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- Q5. A 1.2 m tall girl spots a balloon moving with the wind in a horizontal line at a height of 88.2 m from the ground. The angle of elevation of the balloon from the eyes of the girl at any instant is 60°. After some time, the angle of elevation reduces to 30°. Find the distance travelled by the balloon during the interval.
- Q4. The angle of elevation of a jet fighter from a point A on the ground is 60°. After a flight of 15 seconds , the angle of elevation changes to 30°. If the jet is flying at a speed of 720 km/hr, find the constant height at which the jet is flying.
- Q3. The angle of elevation of a jet plane from a point A on the ground is 60°. After a flight of 30 seconds, the angle of elevation changes to 30°. If the jet plane is flying at a constant height of 3600V3rn, Find the speed of the jet plane.
- Q2. From the top of a building 60 m high , the angles of depression of the top and bottom of a tower are observed to be 30° and 60°. Find the height of the tower.
- Q1. From a window( h metres high above the ground) of a house in a street, the angle of elevation and depression of the top and the foot of another house on the opposite side of the street are θ and (/) respectively. Show that the height of the opposite house is h(1+ tan θ cot 0) m