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A 4 m long ladder weighing 25 kg rests w...

A `4 m` long ladder weighing `25 kg` rests with its upper end against a smooth wall and lower end on rough ground.What should be the minimum coefficient of friction between the ground and the ladder for it to be inclined at `60^(@)` with the horizontal without slipping? `(Take g =10 m//s^(2))`

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