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2:18 141 98 Expert Q&A A uniform plank of mass M and length L leans against a vertical wall. The initial angle it makes with

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2:18 141 98 Expert Q&A A uniform plank of mass M and length L leans against a vertical wall. The initial angle it makes with the horizontal ground is 60. It is let go from rest and slides down frictionlessly. The moment it leaves contact with the wall, what angle does it make with the ground? There is no friction anywhere

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