A speeder is pulling directly away and increasing his distance froma police car that is moving at 27 m/s withrespect to the ground. The radar gun in the police car emits anelectromagnetic wave with a frequency of 8.00 109 Hz. The wave reflects from thespeeder's car and returns to the police car, where its frequency ismeasured to be 320 Hz less than theemitted frequency. Find the speeder's speed with respect to theground.

I got 39m/s but it was wrong.

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