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a system consisted of two objects sitting on a floor, a 15kg object on top with...

a system consisted of two objects sitting on a floor, a 15kg object on top with a 50kg object at the bottom. The sliding coefficient of friction between the two object was 0.3. A 20N force was used to pull the 15kg object. Determine the floor static coefficient of friction such that the 50kg object was at rest.
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