1.

It is difficult to lift a large stone in the earth surface but easy to lift the small one

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ANSWER:it is because as we know that ,the mass of the large stone is often more than the smaller ONE.the effect of the attraction of the earth on a BIGGER stone can be observed more than the effect of attraction of the earth on a smaller one.hence it is DIFFICULT to lift a large stone than the smaller one on the earth surface.

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