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(Solved): Draw free-body diagrams for the motion of the mass in the following figures and write down the equa ...
Draw free-body diagrams for the motion of the mass in the following figures and write down the equations of motion by applying Newton's law. Assume that the coordinate \( x(t) \) starts from the static equilibrium position. (a) u(t) is a given displacement of the end of the spring. (b) \( u(t) \) is a force acting on the mass.