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differential equations: a 2kg mass is placed on a spring with k=8. at t=0, the system...

differential equations:

a 2kg mass is placed on a spring with k=8. at t=0, the system is set in motion from its equilibrium position by an external force given by 2cos(wt) where w is a positive constant. for which value of w, if any, will the system have resonance?
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