The function s(t) describes the motion of a particle along a line. s (t) = t

The function s(t) describes the motion of a particle along a line. (a) (b) (c) 23 Find the velocity function v(t) of the particle at any time t 2 0. v(t) = Identify the time interval(s) in which the particle is moving in a positive direction. (Enter your answer using interval notation.) Identify the time interval(s) on which the particle is moving in a negative direction. (Enter your answer using interval notation.) Identify the time(s) at which the particle changes direction. (Enter your answers as a comma-separated list.)