A person standing on an open ground hears the sound of a jet aeroplane , coming from north at an angle `60^(@)` with ground level ,But he finds the aeroplane right vertically above his position , if V is the speed of sound , speed of the plane is :

The angle of elevation of an aeroplane from a point on the ground is 60^(@) .After 15 seconds flight ,the elevation changes to 30^(@) .If the aeroplane is flying at a height of 1500sqrt(3) m , find the speed of the plane

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?

What would a person hear, if he moves away from a source of sound with the speed of sound?

What would a person hear, if he moves away from a source of sound with the speed of sound?

An aeroplane is moving one kilometer high from west to east horizontally. From a point on the ground due south, the angle of elevation of the aaeroplane is 60^(@) , and after 10 second, the angle of elevtion of the aeroplane is observed as 30^(@) , then the speed (in m//s ) of the aeroplane is

The angle of elevation of an aeroplane from a point on the ground is 60^(@) . After flying for 30 seconds, the angle of elevation charges to 30^(@) . If the aeroplane is flying at a height of 4500 m, then what is the speed (in m/s) of aeroplane

From a point on the ground, the angle of elevation of an aeroplane flying at an alitdude of 600m change from 40^(@) " to " 30^(@) in 5 seconds. Find the speed of the aeroplane ( in kmph).