A 200 meter long horizontal plank whose mass is 300 kg is, Ask an Expert

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A 2.00 meter long horizontal plank whose mass is 3.00 kg is placed so that the very end (the right end) rests on a retaining wall. The left end is put on the tailgate of the truck. However the tailgate is tilted a bit, so it only contacts the board at a point 25 cm from the end. Find the force acting on the board by the tailgate. Find the force acting on the board by the retaining wall.

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