A 50-N box is slid straight across the floor at constant speed by a force of 25

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A 50-N box is slid straight across the floor at constant speed by a force of 25 N, as depicted in Fig. 4-3(a). 

(a) How large a friction force impedes the motion of the box? 

(b) How large is the normal force? 

(c) Find μk between the box and the floor.F Fw 25 N 40%

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