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Two police car sirens have identical frequencies of 700Hz. Matthew on his bike which is at...

Two police car sirens have identical frequencies of 700Hz. Matthew on his bike which is at rest relative to the ground hears beats with a frequency of 18 beats/s when one car is approaching from one direction at 8.0 m/s. (I)What is the speed of the other car also moving towards him? (II)When both cars arrive in front of Patrick and stop, he realizes the police are going after him; he starts running away on his bike from both cars at 5m/s. If they are now chasing after him at their original speeds, how many beats per second would Matthew hear? Assume the speed of sound to be 343m/s.

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