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The function s(t) describes the motion of a particle along a line. s(t) = 18t − t2 (a) Find the velocity function v(t) of the particle at any time t ≥ 0. v(t) = (b) Identify the time interval in which the particle is moving in a positive direction. (0, ∞) (0, 9) (0, 18) (18, ∞) (9, ∞) None (c) Identify the time interval in which the particle is moving in a negative direction. (0, ∞) (0, 9) (0, 18) (18, ∞) (9, ∞) None (d) Identify the time at which the particle changes direction. t =

The function s(t) describes the motion of a particle along a line. s(t) = 18t − t2 (a) Find the velocity function v(t) of the particle at any time t ≥ 0. v(t) = (b) Identify the time interval in which the particle is moving in a positive direction. (0, ∞) (0, 9) (0, 18) (18, ∞) (9, ∞) None (c) Identify the time interval in which the particle is moving in a negative direction. (0, ∞) (0, 9) (0, 18) (18, ∞) (9, ∞) None (d) Identify the time at which the particle changes direction. t =

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The function s ( t ) describes the motion of a particle along a line.
s ( t ) = 18 t − t 2
(a) Find the velocity function v ( t ) of the particle at any time t ≥ 0 .
v ( t ) =
(b) Identify the time interval in which the particle is moving in a positive direction. ( 0 , ∞ ) ( 0 , 9 ) ( 0 , 18 ) ( 18 , ∞ ) ( 9 , ∞ ) None (c) Identify the time interval in which the particle is moving in a negative direction. ( 0 , ∞ ) ( 0 , 9 ) ( 0 , 18 ) ( 18 , ∞ ) ( 9 , ∞ ) None (d) Identify the time at which the particle changes direction. t = ◻

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