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A 1 kg mass stretches a spring 9.8 cm. The mass is acted on by an external force of 4 cos 9t lb. If

A 1 kg mass stretches a spring 9.8 cm. The mass is acted on by an external force of 4 cos 9t lb. If u(0) = 0 and u'(0) = 0, find (a) u(t) and (b) the number of beats per second.

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