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.

The angle of elevation of a jet plane from a point A on the ground is 60^(@) . After a flight of 15 seconds, the angle of elevation changes to 30^(@) . If the jet plane is flying at a constant height of 1500sqrt3 meter, find the speed of the jet plane. (sqrt3 = 1.732)

A tower is 10sqrt3 metres high. If a point on the ground is 30m away from its foot, then the angle of elevation is

The length of shadow of a tower standing on the ground is found to be 60 metres more when the Sun's angle of elevation changes from 45^@ to 30^@ . Find the height of the tower.

The angle of elevation of the top of a tower from a point O on the ground, which is 450 m away from the foot of the tower, is 40^(@) . Find the height of the tower.

Narayan, standing in the midst of a field, observes a flying bird in his north at an angle of elevation of 30^@ and aft er 21 minutes he observes the bird in his south at an angle of elevation of 60^@ . If the bird flies in a s traight line all a height of 50sqrt3 metres, then find its speed in metre per minuts.

The length of shadow of a tower standing on the ground is found to be 60 metres more when the sun's angle of elevation changes from 30^(@) to 45^(@) . Find the height of the tower.

Monu standing in the midst of a field, observes a flying bird in his north at an angle of elevation of 30^(@) and after 2 minutes he observer the bird in his south at an angle of elevation of 60^(@) . If the bird flies in a straight line all along at a height of 50sqrt(3) metres, find its speed in kilometre per hour.

Mohit, standing in the midst of a field, observes a flying birds in his north at an anlge of elevation of 30^@ and after 2 minutes he observes the birds in his south at an angle of elevation of 60^@ . If the bird flies in a straight line all along at a height of 50sqrt3 metres then find its speed in km//hr .

If the length of the shadow of a vertical pole on the horizontal grounds is sqrt3 times its height, then the angle of elevation of the sun is

A tower stands vertically on the ground. From a point on the ground.which is 30 m away from the foot of the tower, the angle of elevation of the top of the tower is found to be 45^(@) . Then the height of the tower is