Question
On the airport, the sunshines just over the head. When the aeroplane takes off at an angle of 23° to horizontal, the shadow moves along the track with velocity 240km/hr. Find the velocity with which the aeroplane moves away from the earth. (Take 
)
Solution
The vertical component ofvelocity of the airplane will give us the velocity with which the airplane moves away from the Earth.
As the aeroplane takes off at angle 
with horizontal,
∴ 
∴ 
