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Math Help - motion

  1. #1
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    motion

    An objects position equations:

    x=3t^2-6t
    y=t^3-3t

    x'=6t-6
    y'=3t^2-3

    When at rest v=0=sqr root of (x'^2 +y'^2)

    It does not appear to ever be at rest. Is that correct? The question asks when is the object at rest.
    Last edited by Stuck Man; December 9th 2011 at 05:24 AM. Reason: mistake
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  2. #2
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    Re: motion

    Quote Originally Posted by Stuck Man View Post
    An objects position equations:
    x=3t^2-6t, y=t^3-3t
    x'=6t-6, y'=3t^2-3
    When at rest v=0=sqr root of (x'^2 +y'^2)
    It does not appear to ever be at rest. Is that correct? The question asks when is the object at rest.
    Well it is true that if t=1 then v=0 is it not?
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  3. #3
    Senior Member
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    Re: motion

    I found my mistake in the arithmetic.
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