Please help with this one

The position function of a particle is given by $\displaystyle \mathbf r(t) = \langle -1 t^2, -2 t, t^2 - 1 t\rangle$.

At what time is the speed minimum?

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- Oct 10th 2009, 09:13 PMzpwnchenMinimum speed given parametric form of position vector
Please help with this one

The position function of a particle is given by $\displaystyle \mathbf r(t) = \langle -1 t^2, -2 t, t^2 - 1 t\rangle$.

At what time is the speed minimum? - Oct 10th 2009, 10:16 PMmr fantastic