A 46.1-kg box rests motionless on a rough horizontal surface. The coefficients of friction between the box and the surface are =0.284 and -0.136. Calculate the magnitude of the friction force f on the box after a horizontal pushing force of magnitude 80-N is applied to it. [Hint: First check to see if the box experiences static or kinetic friction.] f = _N Record your numerical answer below, assuming three significant figures. You Answered 61.442 Correct Answer 80 margin of error +/- 1%