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5. A uniform plank rests on a level surface as shown below. The
plank has a mass of 30 kg and is 6.0 m long. How much mass
can be placed at its right end before it tips? (Hint: When the
board is about to tip over, it makes contact with the surface only
along the edge that becomes a momentary axis of rotation.)
-4.2 m-
+1.8 m-

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