Question: A box is pushed through $4.0 \mathrm{~m}$ across a floor offering $100 \mathrm{~N}$ resistance. How much work is done by the resisting force?
Solution:
Resisting force
$F_{R}=F . d$
$F_{R}=F d \cos \theta=100 \times 4$
$F_{R}=400 \mathrm{~J}$
