A bat flying at 4.5 ms-1 uses a ultrasonic pulse of frequency 40.0 kHz

The Question: A bat flying at 4.5 ms-1 uses a ultrasonic pulse of frequency 40.0 kHz to locate a flying insect that it is chasing. If the echo that the bat receives back from the insect has a frequency of 40 kHz how fast is the insect flying.

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