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A destroyer, cruising at 13 m/s, the North Atlantic looks for Russian submarines with its sonar....

A destroyer, cruising at 13 m/s, the North Atlantic looks for Russian submarines with its sonar. The sonar emiits an ultrasonic ping of 49 kHz. Assume that the speed of sound in water is 1560 m/s.

The sonar detects an echo of 49,378.3 Hz. A spotter on the bow of the destroyer briefly sees the submarine's periscope and determines that the submarine is travelling in the same direction as the destroyer.

a) Calculate the speed of the submarine.

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