Answer:
The plane was 923.5 feet high after 10 seconds.
Step-by-step explanation:
Angle made by plane with ground during take off = x = 20°
Average speed of plane = 270 ft/s
Let the height of Plane after 10 seconds from the takeoff = H
Distance covered by plane in 10 seconds = 270 ft/s × 10 sn= 2700 ft
According to trigonometric ratios:

Here , perpendicular = H
Hypotenuse = 2700 ft


The plane was 923.5 feet high after 10 seconds.