Question

The angle of elevation of a jet plane from a point on the ground has measure 60°.After a flight of 30 seconds,the angle of elevation has measure 30°.If the jet plane is flying at a constant height Of 4500√3 , find the speed of the jet plane.​

Answer 1

Answer:

It is given that after 15 seconds angle of elevation changes from 60° to 30°. Let AC be the rope whose length is 20 m, and AB be the vertical pole of height h m and the angle of elevation of A at point C on the ground is 30°. Hence, the height of the pole is 10 m.