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[" 30.A "4m" long ladder weighing "25kg"...

[" 30.A "4m" long ladder weighing "25kg" 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=10ms^(-2))],[[" (1) "0.288," (2) "0.732," (3) "0.546," (4) "0.189]]

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