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Mathematics 15 Online
OpenStudy (elusive):

For this problem, why should one use cos instead of sin? "Suppose that an object attached to a coiled spring is pulled down a distance of 9 inches from its equilibrium position and then released. If the time for one oscillation is 5 seconds, write an equation that describes its motion. Assume that no other forces are acting upon the object or spring and that the motion will be simple harmonic."

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