A box is pulled along the floor at a constant velocily by a rope:. The box is 8 kg and he pulling force is 45N.

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Is there any opitions? if you have the periodic table, the noble gases are 8a family, the halogen are the 7a family, and the nonmetal are  carbon, nitrogen, phosphorus, oxygen, sulfur, selenium, fluorine, chlorine, bromine, iodine and astatine.

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