A 507-kg crate rests on a level floor at a shipping dock, Ask an Expert

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A 50.7-kg crate rests on a level floor at a shipping dock. The coefficients of static and kinetic friction are 0.628 and 0.358, respectively. What horizontal pushing force is needed to (a) just start the crate moving and (b) slide the crate across the dock at a constant speed?

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