A particle moves along a straight line so that its acceleration at any given time t is a(t) = 2t - 13 in units of feet and seconds). If the initial velocity of the particle is 36 feet/sec, at what time t during the interval 0 ≤ t ≤7 does the particle change direction? 1. t = 5 seconds 2. t = 4 seconds 3. t = 3 seconds

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A:

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