A person standing on an open ground hears the sound of a jet aeroplane, coming from north at an angle 60 o 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:

Question

A person standing on an open ground hears the sound of a jet aeroplane, coming from north at an angle 60 o 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:, 2 v 3, v, v 2, 3 2 v

MARKS App · Accepted Answer

d v s = d c o s 60 o v a v a = v s 2 = v 2

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