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[" A door "1.6m" wide requires a "],[" m...

[" A door "1.6m" wide requires a "],[" minimum force of "1N" to be "],[" applied at the free end to open "],[" or close it.The minimum force "],[" that is required at a point "],[0.4m" away from the hinges for "],[" opening or closing the door is "]

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