1 foot. Suppose the 2 A mass weighing 2 pounds stretches a spring mass is pulled down an additional feet and then released. If 4 there is no damping, which of the following Initial Value Problems model this situation? u" + 16и — 0, u(0) u'(0) = 0 2' 1 2u" + u(0) 4' 1 u' (0) = 0 2 1 0, и(0) u'(0) = 0 2' 2u" -U = 2 1 2u" + 4u %3D 0, и(0) — 0, и'(0) О u" + 64и — 0, и(0) 1 - u' (0) = 0 - 4' 1 u" + u + 64u = 0, u(0) = 0, 4 1 u'(0) 4 - O " + 4u' + 64u = 0, u(0) 1 u'(0) = 0

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