force of magnitude

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Two boxes are at rest on a smooth, horizontal surface. The boxesare in contact with one another. If box 1 is pushed with a force ofmagnitude F= 12.7 N, the contact force between the boxes is8.70 N; if, instead, box 2 is pushed with the force F, the contact force is 4.00 N. In either case, the boxes move together with anacceleration of 1.80 m/s. What is the mass of box 1? What is the mass of box 2?

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