Assuming that the angle at which you push on the edge of the box is again $45,$ with what magnitude of force$$FpFp$$ should you push if the box were to slide down the wall at a constant velocity? Note that, in general, the magnitude of the friction force will change if you change the magnitude of the pushing force. Thus, for this part, assume that the magnitude of the friction force is f$=0\mathrm{.}516$Fpf$=0\mathrm{.}516$Fp$.$

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FpFp $=$

$\mathrm{.}73$