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physics

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A motorist travelling at 82 km/hr is being chased by a police car at 121 km/hr. If the police car starts from 4.0 km back, how long does it take to catch the motorist? Leave time in hours.

  • physics -

    relative velocity=121-82 km/hr
    relative distance=4km

    use distance=velocity*time
    solve for time

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