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[" 3A 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,then speed of the plane is "],[[" (a) "(sqrt(3))/(2)v," (b) "v],[" (c) "(2v)/(sqrt(3))," (d) "(v)/(2)]]

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