Kercey pushes a 6.7-kg crate along a rough surface with 27.43 N of force. He observes that it is only accelerating at a rate of 3 m/s². What must the value of the force of friction be? (Assume that the only two forces acting on the object are friction and Kercey). a. -7.33 N b. 7.33 N c. 2.78 N d. -2.78 N

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