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In a high-speed car chase, a bank robber is driving at 50 m/s, being chased by...

In a high-speed car chase, a bank robber is driving at 50 m/s, being chased by a police car travelling at 40 m/s. The police siren has a frequency of 1000 Hz and the speed of sound at this location is 340 m/s.

What frequency does the robber hear as the cop car gives chase?

Another officer, standing on the road, is placing spike strips ahead of the chase. What frequency will the officer hear as the cars are approaching?

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