Q. 134.6( 10 Votes )

The angle of elev

Answer :

Let the B and C be the positions of aero plane. By given information we can make a diagram for the above



As the height is constant



Let AL = x


Let the speed of plane be y m/s


Then the distance travelled by plane in 15 sec = BC = speed × time = 15y


BC = LM = 15y [1]


In ABL




x = 1500


AM = AL + LM = x + 15y = 1500 + 15y [from 1]


In ACM




100 + y = 300


y = 200 m/s



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