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Math Help - Minimum speed given parametric form of position vector

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    Minimum speed given parametric form of position vector

    Please help with this one

    The position function of a particle is given by \mathbf r(t) = \langle -1 t^2, -2 t, t^2 - 1 t\rangle.
    At what time is the speed minimum?
    Last edited by mr fantastic; October 10th 2009 at 10:15 PM. Reason: Moved from another thread
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    Quote Originally Posted by zpwnchen View Post
    Please help with this one

    The position function of a particle is given by \mathbf r(t) = \langle -1 t^2, -2 t, t^2 - 1 t\rangle.
    At what time is the speed minimum?
    Can you find the velocity vector? Can you get the speed from this? Please show all your working and state where you get stuck.
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