The smooth marble floor has lower friction coefficient
Explanation:
Remember that when you are pushing any object theres a force pulling on the opposite direction to you, that is the friction force, which is given by the next formula:
SInce he is pushing the same exact box, with the same exact weight, the only reason to find it easier is that the marble floor has a lower coefficietn friction, and for that reason he has less friction force working against him.
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