A particle moves along a straight line and its position at time t is given by s(t) = 2t3 - 21t2 + 72t, t>0 where s is measured in feet and t in seconds. (A) Use interval notation to indicate the time interval or union of time intervals when the particle is moving forward and backward. .... Forward: Backward: (B) Use interval notation to indicate the time interval(s) when the particle is speeding up and slowing down. ................... Speeding up: Slowing down:

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A: Question is solved.

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