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The position of a mass that is oscillating on a spring is given by
x = (12.3 cm) cos[(1.26 s-1)t]. What is the speed of the mass when t = 0.805 s?
A) - 13.2 cm/s
B) 13.2 cm/s
C) 8.19 cm/s
D) - 8.19 cm/s
E) 0 cm/s
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