A mass is oscillating on a spring with a period of 4.60 s. At t =0 s the mass has zero speed and is at x = 8.30 cm. What is its acceleration at t = 2.50 s? (radians!)
a) 1.33 cm/s2
b) 0.784 cm/s2
c) 11.5 cm/s2
d) 14.9 cm/s2
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