physics

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An object of mass 10 kg is pulled along a horizontal floor of a distance 3 m. The friction force between the object and the floor is 50 N. What is the minimum work done by the pulling force?

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    This was actually a multiple choice question. The answer given was 450J. I'm guessing, they added the weight to frictional force. But thing is, the object moved horizontally, so how could one just do this -> (100+50) x 3.

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