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A meter scale of mass m ,Young modulus Y...

A meter scale of mass m ,Young modulus Y and cross section area A is hanged vertically from ceiling at zero mark.Then separation between 20cm and 80cm mark will be -`((mg)/(AY)` is dimensionless):
(1) `30(mg)/(AY)`cm+60cm
(2) `20(mg)/(AY)`cm+60cm
(3) `50(mg)/(AY)`cm+60cm
(4) `40(mg)/(AY)`cm+60cm

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