A jet plane in straight horizontal flight passes over your head.When it is directly above you, the sound seems to come from a point behind the plane in a direction 30 $\degree$ from the vertical.The speed of the plane is:
A)the same as the speed of sound
B)half the speed of sound
C)three-fifths the speed of sound
D)0.866 times the speed of sound
E)twice the speed of sound

Question

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The Answer of A jet plane in straight horizontal flight passes over your head.When it is directly above you, the sound seems to come from a point behind the plane in a direction 30 $\degree$ from the vertical.The speed of the plane is:
A)the same as the speed of sound
B)half the speed of sound
C)three-fifths the speed of sound
D)0.866 times the speed of sound
E)twice the speed of sound

A Jet Plane in Straight Horizontal Flight Passes Over Your °\degree°

A Jet Plane in Straight Horizontal Flight Passes Over Your $\degree$