An object attached to a coiled spring is pulled down a distance a from its rest position and then released. Assuming that the motion is simple harmonic with period T, write an equation that relates the displacement d of the object from its rest position after t seconds. Also assume that the positive direction of the motion is up.a = 7;
T = 4 seconds
A. d = -7 cos 
B. d = -7 cos 
C. d = -4 cos 
D. d = -7 sin 
Answer: B
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