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Homework Help: Maximum distance apart from both cars before Car B catches up with Car B

  1. Jun 16, 2009 #1
    1. The problem statement, all variables and given/known data

    Car A travel at uniform velocity at 20 metre per second from t=0s.
    Car B starts with 5 metre per second during t=0s and accelerates uniformly to 30 metre per second in t=30s.It travels at constant velocity of 30 metre per second from there onwards

    2. Relevant equations

    3. The attempt at a solution
    A velocity-time graph is plotted for this question.

    But i just simply dunno wad to do regarding the maximum distance between both of the cars before Car B catches up with Car A.
    I need urgent help and i mean it,thanks...
    what can i do with the graph to solve this question?
  2. jcsd
  3. Jun 17, 2009 #2


    User Avatar
    Science Advisor
    Homework Helper

    Welcome to PF!

    Hi cyy91! Welcome to PF! :smile:

    The distance between the cars at any time is the horizontal distance between the two graphs at that value of t.

    There are no curves … the graphs is only straight lines … and two straight lines either get continually further apart, or continually closer together … so the maximum distance must be at one of the "joins". :wink:
  4. Jun 17, 2009 #3
    thx alot...understood...
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