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A 3.6-meter long horizontal plank is held up by two supports. One support is at the...

A 3.6-meter long horizontal plank is held up by two supports. One support is at the left end, and the other is 0.80 m from the right end. The plank has uniform density and has a mass of 40 kg. How close can a 70 kg person stand to the unsupported end before causing the plank to rotate?

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