A 40-N Crate Rests on a Rough Horizontal Floor

question 66

Multiple Choice

A 40-N crate rests on a rough horizontal floor.A 12-N horizontal force is then applied to it.If the coefficients of friction are = 0.5 and = 0.4, the magnitude of the frictional force on the crate is:

• A)8 N
• B)12 N
• C)16 N
• D)20 N
• E)40 N

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