An unforced spring-mass system with no damping can be modeled by the equation y″ + ky = 0, where k is the spring constant. However, suppose that the spring loses elasticity with time. A possible model for an “aging” spring-mass system is y″ + 2e-0.12t y = 0. Suppose that the spring is stretched two units from equilibrium and released from rest. Use the technique of Example 4 to plot a solution of y versus t on the time interval [0,100].
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