A uniform wooden plank of length L = 6 m and mass M = 90 kg rests on top of two sawhorses separated by D = 1.5 m, located equal distances from the center of the plank. Your cousin Andy tries to stand on the right-hand end of the plank.

If the plank is to remain at rest, how massive can Andy be?

If the plank breaks in the middle with Andy sitting at the right end, how fast will he be moving immediately after?

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