A mass weighing 4 lb stretches a spring 1.5 in. The mass is given a positive displacement of 2 in from its equilibrium position and released with no initial velocity. Assuming that there is no damping and that external force of 2 cos 3t lb, formulate the initial value problem describing the motion of the mass. (A computer algebra system is recommended.) (a) Find the solution. 16 u(t) = 0.101 cos (16r) + 247cos (31) (b) Plot the graph of the solution. u 0.15 0.10 0.05 -0.05 -0.10 -0.15 O u 0.15 0.10 0.05 -0.05 X MAGMAMAN u 0.15 0.10 0.05 -0.05 -0.10 -0.15 u 0.15 0.10 0.05 -0.05 0105

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