A 16 pound weight stretches a spring4 feet Assume the surounding medium offern a damping force of 4 tumes the instantancous velocity The mass is driven by an external force of 25 cos t. The correct differential equation for the position, x(1), of the mass at a function of time, 1,js (Use g = 32ft/s) Select the correct answer O a d'x dr +4 + 4x = 25 cos i Ob. d'x 1 dr +4x =0 4 dr Oc d'x dr +4x = 25cost dr dr Od 1 d'x dr +4x = 25cost 2 dr dr dx Oe 1 d'x -4 2 dr +4x 25cost

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