Question 2 • AP Calculus AB - MA5186 A
The object travels toward the right when its velocity is positive. Differentiate its position, x(t) = 2t² − 5t − 18, to get v(t) = 4t − 5. Solving 4t − 5 > 0 gives t > 5/4 = 1.25, so the correct choice is t > 1.25.
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