a 680 kg crate rests on a level floor at a, Mechanical Engineering

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a 680 kg crate rests on a level floor at a

A 68.0 kg crate rests on a level floor at a shipping dock. The coefficients of static and kinetic friction are 0.780 and 0.430, respectively.

(a) What horizontal pushing force is needed to just start the crate moving?

(b) What horizontal pushing force is needed to slide the crate across the dock at a constant speed?

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Mechanical Engineering: a 680 kg crate rests on a level floor at a

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