Physics

Problem

A person standing on an open ground hears the sound of a jet aeroplane, coming from north at an angle

60^\circ

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.

\frac{\sqrt{3}}{2}v

\frac{2v}{\sqrt{3}}

v

\frac{v}{2}