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48. An object moves along a straight line so that at any time t, 0 < t < 9, its position is giv by a

48. An object moves along a straight line so that at any time t, 0 < t < 9, its position is giv by a (t) = 7+ 6t -t. For what value of t is the object at rest? ? A t = 3 B t = 6 C = 13 2 D t = 7

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