A CD case slides along a floor in the positive direction of an x axis while an applied force F acts on the case. The force is di- rected along the x axis and has the x component Fax= 9x -3x2, with x in meters and Fax in newtons. The case starts at rest at the position x = 0, and it moves until it is again at rest. (a) Plot the work does on the case as a function of x. (b) At what position is the work maximum, and (c) what is that maximum value? (d) At what position has the work decreased to zero? (e) At what position is the case again at rest?

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