Hello, If someone could help me answer the following question: \"The speed of so

Question

Hello,
If someone could help me answer the following question:
"The speed of sound in air is about 760 MPH. Suppose nowthat a police car is sounding its siren, and comng toward you at 80MPH. Is the sound of the siren coming toward you at 760 MPH +80 MPH = 840 MPG, as measured relative to the ground? Explain?"
Thank you
If someone could help me answer the following question:
"The speed of sound in air is about 760 MPH. Suppose nowthat a police car is sounding its siren, and comng toward you at 80MPH. Is the sound of the siren coming toward you at 760 MPH +80 MPH = 840 MPG, as measured relative to the ground? Explain?"
Thank you

Explanation / Answer

   You are right, relative speed ( w.r.t.)ground   =   speed of sound + speedofcar   =   840   mph    Sould the car be going awar, you mustsubtract speed of car instead of adding.

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