A particle has zero velocity initially (i.e., at time t = 0) and its acceleration at 1 seconds is a(t) = 72t – 4t³ meters-per- second per second. During the time interval [5, 8] seconds, (i) the average acceleration of this particle is -689 (ii) the average speed of this particle is meters-per-second per second meters-per-second.

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