An object of mass m (in grams) attached to a coiled spring with damping factor b (in grams per second) is pulled down a distance a (in centimeters) from its rest position and then released. Assume that the positive direction of the motion is up and the period is T (in seconds) under simple harmonic motion. Develop a model that relates the distance d of the object from its rest position after t seconds.m = 15, a = 8, b = 0.55, T = 3
A. d = -8e-0.55t/30 cos 
B. d = 8e-0.55t/30 cos 
C. d = -8e-0.55t/30 cos 
D. d = 8e0.55t/30 cos 
Answer: A
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