Suppose the position of a particle in motion at time t is given by the vector parametric equation r(t) = (4(t − 3)², 4, 2t³ — 9t²). (a) Find the velocity of the particle at time t. (t) = (b) Find the speed of the particle at time t. Speed= (c) Find the time(s) when the particle is stationary. If there is more than one correct answer, enter your answers as a comma separated liet

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