88. First, we imagine that the small square piece (of mass m) that was cut from the large plate is returned to it so that the large plate is again a complete 6 m ×6 m (d=1.0 m) square plate (which has its center of mass at the origin). Then we “add” a square piece of“negative mass” (–m) at the appropriate location to obtain what is shown in Fig. 9-75. If the mass of the whole plate is M, then the mass of the small square piece cut from it is
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