Q. 394.6( 60 Votes )

The angle of elev

Answer :

200 m/s



Let, initially plane is at C and after 30 seconds it moves to D. therefore, distance travelled by plane in 30 secs = CD = AE = y m


Let, AB = x m


Height of plane from ground = AC = DE = 3000√3 m


In ABC,




x = 3000 m


Now, in ADE,





3000 + y = 3000√3 × √3


3000 + y = 9000


y = 6000 m


Therefore, distance travelled by plane in 30 secs is 6000 m


Therefore, speed of plane is




speed = 200 m/s


Hence, speed of the airplane is 200 m/s.


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