fter t hours a freight train is s(t) = 17t² - 2t³ miles due north of its starting point (for 0 ≤ t ≤ 9). (a) Find its velocity at time t = 3 hours. mi/hr (b) Find its velocity at time t = 7 hours. mi/hr (c) Find its acceleration at time t = 1 hour. mi/hr²

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