A uniform plank has mass M = 9 kg and length L = 4.0 m. A box of mass m = 2.2 kg rests on it at a distance Xg = 2.7 m from the left end of the plank. The plank is supported by two supports at distances X1 = 0.8 m %3D %3D and X2 = 3.7 m from the left end of the plank. %3D

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