The figure shows the velocity v or position s of a body moving along a coordinate line as a function of time t . Use the figure to answer the question. v (ft/sec)
When does the body reverse direction?
A. t = 4, t = 7 sec
B. t = 7 sec
C. t = 2, t = 3, t = 5, t = 6, t = 7 sec
D. t = 4 sec
Answer: D
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