Solve the following :

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

$F_{R}=F . d$

$F_{R}=F d \cos \theta=100 \times 4$

$F_{R}=400 \mathrm{~J}$

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