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The position u(t) of a certain spring-mass system satisfies the initial value problem 14u + ku = 0, u(0) = 9, u'(0) = v

The position u(t) of a certain spring-mass system satisfies the initial value problem 14u" + ku = 0, u(0) = 9, u'(0) = v > 0. If the period is 6 and the amplitude is 11, find k and v. k = U =

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