The equation gives the position s = f(t) of a body moving on a coordinate line (s in meters, t in seconds). s (m)
When is the body moving backward?
A. 2 < t < 3, 4 < t < 5, 7 < t < 9
B. 8 < t ? 10
C. 2 < t < 3, 4 < t < 5, 7 < t < 8
D. 8 < t < 9
Answer: A
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+ 1)(
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