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6. A spring for which stiffness k
with its upper end fixed.A mass of 1 kg is attached to the lower end.
Initially the weight is at rest as its equilibrium position. Assume that
4 N/m hangs in a vertical position
1, when 0<t <1
an external force g(t) =
0, when t> 1
Discuss the resulting motion of the mass, neglecting air resistance.

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