A boy of mass 30 Kg is sitting at a distance of 2 m from the middle of a see-saw, where should a boy

Solution

Let the 40 Kg boy sits at a distance of X m from the middle of the see-saw,

According to the Principle of Moment

Anti Clockwise moment = Clockwise moment

30 kg-f x 2 m = 40 kg-f x X

Or, X = 1.5 m

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