A boy watches a jet plane flying from north to south. When the jet is just seen above his head, the sound of jet appears to reach him makin some angle with horizontal from north.If the velocity of jet is v/2, then find the angle.

A man on the ground finds that when he sees a jet plane just over his head, the sound is heart at an angle of 30^(@) with the vertical from his left. If the velocity of sound is v, what is the velocity of the jet plane?

A target situated on a hill can be seen from the foot at angle alpha above the horizontal .The distance of the target along the horizonal is R. if a shell is fired from the foot at an angle beta with the horizontal, find the velocity required for it to strike the target.

The angle of elevation of a jet plane from a point on the ground is 60^@ . After a flight of 15 seconds, the angle of elevations changed to 30^@ . If the jet plane is flying horizontally at a constant height of 1500sqrt3 metres, find the speed of the jet plane.

A fighter jet plane is flying horizontally drops a bomb find the nature of path of bomb as seen by pilot.

Two trains A and B are moving with same speed of 100km//hr .Train A moves towards east and train B moves towards west.An an instant when the trains are moving side by side, an aeroplane files above the trains horizontally.For the passengers in the train A , the plane appears to fly from North to South direction.For the passengers in the train B , the plane appears to fly in a direction making an angle 60^(@) to North-South direction.

If a man is running on horizontal road, raise appears to him coming at 30^(@) from vertical. When he double his velocity rain appears to him coming at angle theta from vertical. Then theta is