Question: After t hours a freight train is s(t) = 17t- - 2t' miles due north of its starting point (for 0 s t s 9).

After t hours a freight train is s(t) = 17t- -

2t' miles due north of its starting point (for 0 s t

After t hours a freight train is s(t) = 17t- - 2t' miles due north of its starting point (for 0 s t s 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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