The function s(t) describes the motion of a particle along a line. s(t) = -14t+ 21 %3D (a) Find the velocity function v(t) of the particde any time t2 0. v(t) = (b) Identify the time interval(s) in which the particle is moving in a positive direction. (Enter your answer using interval notation.) (c) Identify the time interval(s) on which the particle is moving in a negative direction. (Enter your answer using interval notation.) (d) Identify the time(s) at which the particle changes direction. (Enter your answers as a comma-separated list.)

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