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A4 m long ladder weighing 25 kg rests wi...

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

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