A uniform rod of mass 20 kg and length 5 m leans against a smooth vertical wall making an angle of 60 with it. The other end rests on a rough horizontal floor. The friction force that the floor exerts on the rod is (Take g = 10 m/s 2 )

1. A. 200 3 N
2. B. 100 N
3. C. 100 3 N
4. D. 200 N

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