Minimum speed given parametric form of position vector

**zpwnchen** · October 10th 2009, 09:13 PM

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?

**mr fantastic** · October 10th 2009, 10:16 PM

Originally Posted by zpwnchen

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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