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Homework Help: A particle's position relative to time

  1. Sep 28, 2008 #1
    The position y of a particle moving along the y axis depends on the time t according to
    the equation y = at - bt2. The dimensions of the quantities a and b are respectively:
    A. L2/T, L3/T2
    B. L/T2, L2/T
    C. L/T, L/T2
    D. L3/T, T2/L
    E. none of these

    I don't understand what the question is asking, nor do I understand what the variables in the answers represent. Any help making sense of the question and answers is greatly appreciated.
  2. jcsd
  3. Sep 29, 2008 #2


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    Staff Emeritus
    Science Advisor
    Gold Member

    Its basically the kinematic equation for position. In the kinematic equation a and b are represented by physical quantities which have units. What are the dimensions of those physical quantities.
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