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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 :

A

`(sqrt(3))/(2) v`

B

`(2v) /(sqrt(3))`

C

v

D

`(v)/(2)`

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