A 32.00-lb weight stretches a certain spring 6.40 ft when the weight and spring are placed in a fluid that resists the motion with a force equal to four times the velocity. If the weight is brought to rest and then given a velocity of 16 ft/s, find the equation of motion

A) x = 16 e^ -2x cos x B) x = 16 e^ -2x sin x C) x = 16 e^ -x sin 2x D) x = 16 e^ -2x sin x +15 e^ -2x cos x

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