(Solved): The graph of the velocity function of a particle is given, where t is measure ...

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The graph of the velocity function of a particle is given, where $$t$$ is measured in seconds. Points of inflection occur at $$t=4,8$$. i. Select all intervals for which the particle is speeding up. $$(0,2)(2,4)(4,6)(6,8)(8,9)(9,11)$$ ii. Select all intervals for which the particle is slowing down.