A jet is flying horizontally, as the drawing shows. When the plane is directly overhead at B,

Question:

A jet is flying horizontally, as the drawing shows. When the plane is directly overhead at B, a person on the ground hears the sound coming from A in the drawing. The average temperature of the air is 20 8C. If the speed of the plane at A is 164 m/s, what is its speed at B, assuming that it has a constant acceleration?