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OpenStudy (anonymous):
A stack of books rests on a level frictionless surface. A force is acts on the stack, it accelerates at 3.0 m/s2. A 1.0 kg book is then added to the stack. The same force is applied, and now the stack accelerates at 2.0m/s2. What was the mass of the original stack? A. 1.0kg B. 2.0 kg C. 3.0 kg D. None of above
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