Paula is probably an object with 21 N force friction is pushing back against the object object with a force of 14 N Draw Freebody diagram and determine what the net forces and in what direction is acting
F⃗=P⃗+F⃗fr,\vec F=\vec P+\vec F_{fr},F=P+Ffr,
F=P−Ffr,F=P-F_{fr},F=P−Ffr,
F=21−14,F=21-14,F=21−14,
F=7 N.F=7~N.F=7 N.
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