The function s(t) describes the motion of a particle along a line. s(t) = t3 − 7t2 + 6t   (a) Find the velocity function of the particle at any time t ≥ 0. v(t) =    (b) Identify the time intervals on which the particle is moving in a positive direction. (Enter your answer using interval notation.)   (c) Identify the time intervals on which the particle is moving in a negative direction. (Enter your answer using interval notation.)

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