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5 September, 04:17

Four different observers are standing in a straight line on a street and hear a siren from a police car. Each person recorded their observations in the chart shown. If the people are all lined up on the street at different blocks, and the police siren starts at block 3, which statement describes what block each person is standing at? Wycleff is on block 1, Lilly is on block 4, Quincy is on block 12, and Emilia is on block 17. Lilly is on block 1, Wycleff is on block 4, Quincy is on block 12, and Emilia is on block 17. Lilly is on block 1, Wycleff is on block 4, Emilia is on block 12, and Quincy is on block 17. Wycleff is on block 1, Lilly is on block 4, Emilia is on block 12, and Quincy is on block 17.

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  1. 5 September, 06:30
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    Wycleff is on block 1, Lilly is on block 4, Emilia is on block 12, and Quincy is on block 17.

    Explanation:

    Wycleff was at block 1 and heard a low pitch sound the whole time, so the police car must have been moving away from him.

    Lilly observed was in block 4 change in pitch first. So the car must have passed her first.

    Emilia was at block 12 observed a Doppler effect after Lilly. So the car passed her after passing Lilly

    Quincy was at block 17 so she heard a high pitch sound the whole time, so the police car must have been moving toward him.
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