A person carries a plank of wood 2 m long with one hand pushing down on it at one end with a force F1 and the other hand holding
it up at 50 cm from the end of the plank with force F2 . If the plank has a mass of 20 kg and its center of gravity is at the middle of the plank, what are the magnitudes of the forces F1 and F2 ?
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