Use the accompanying graph of a particle moving on a coordinate line with velocity v = f(t) in ft/sec at time t seconds. The axes are marked off at one-unit intervals. Use these terms to describe the motion state: moving forward/backward, increasing/decreasing speed, and resting. Recall that speed = 
. 
Give the interval(s) when the speed of the particle is decreasing.
A. (6, 11), (15, 21), and (23, 25)
B. (6, 11), (15, 17), and (23, 25)
C. (6, 8), (11, 19), and (23, 25)
D. (6, 8), (15, 19), and (23, 25)
Answer: D
Mathematics
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