A child is walking toward a wall at a speed of 100ms in a, Physics

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A child is walking toward a wall at a speed of 100ms in a

A child is walking toward a wall at a speed of 1.00m/s in a direction at right angles to the wall. As he walks, he blows a whistle steadily. An observer away from whom the child is walking hears 4.00 beats per second. If the speed of sound is 340m/s, what is the frequency of the whistle?

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