# science

Our 10kg mystery box rests on a horizontal floor. The
coefficient of static friction is 0.4 and the coefficient
of kinetic friction is 0.3. Determine the force of
friction acting on the box if a horizontal external
applied force is exerted on it of magnitude:
• (a) 0, (b) 10 N, (c) 20 N, (d) 38 N, and (e) 40 N.

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1. 49

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