Problem

Velocity After t hours a freight train is s(t) = 18t2 - 2t3 miles due north of its start...

Velocity After t hours a freight train is s(t) = 18t2 - 2t3 miles due north of its starting point (for 0 ≤ t ≤ 9).

a. Find its velocity at time t = 3 hours.

b. Find its velocity at time t = 7 hours.

c. Find its acceleration at time t = 1 hour.

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