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Homework Help: Distance and time

  1. Sep 13, 2006 #1
    i need some help with this:

    the distance d that a certain particle moves may be calculated from the expression d=at+bt^2, where a and b are constants; and T is the elapsed time. complete the following statement: the dimensions of the quantities a and b are..., respectively

    help please i don't get it... thanks
  2. jcsd
  3. Sep 13, 2006 #2


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    Staff Emeritus
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    If d is in units of distance, e.g. meters, and time is in units of time, e.g. seconds (s), then if one were to equate d = v*t, v would have to be in units of velocity (speed), e.g. m/s,

    distance = (distance/time) * time or distance (m) = velocity (m/s) * time (s). Units must be consistent.

    Think about the units of acceleration.
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