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Homework Help: Police car chase (from rest)

  1. Oct 27, 2015 #1
    1. The problem statement, all variables and given/known data
    A speeder moving at 120km/h passes a police car that immediately begins to chase, starting from rest, with an acceleration of 1.75 m/s2. How long is the chase?
    The answer is 38.1s

    2. Relevant equations
    At least that's what I tried, but it didn't work out right..,

    3. The attempt at a solution
    (In m/s)

    Police car:

    Then attempting to equate them together:


    ...I did something weird and it's just stopped making sense... Please help (´Д` )
  2. jcsd
  3. Oct 27, 2015 #2
    *1/2at2... That's might be my problem, but it's been an issue for almost an hour now (¬_¬)
  4. Oct 27, 2015 #3


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    Gold Member

    That's one problem. Here's another:
    you seem to have subtracted on the left instead of dividing.
  5. Oct 27, 2015 #4
    (0o0) thank you so much! I can't believe I did that (-。-; I got the right answer this time (^-^)
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