Question: A man exerts a constant force to pull a (50-mathrm{kg}) box across a floor at constant speed. He exerts this force by attaching a rope

A man exerts a constant force to pull a $50-\mathrm{kg}$ box across a floor at constant speed. He exerts this force by attaching a rope to the box and pulling so that the rope makes a constant angle of $36.9^{\circ}$ above the horizontal. The coefficient of kinetic friction for the box-floor interface is $\mu_{k}=0.10$. What is the work done by the man as he moves the box $10 \mathrm{~m}$ ?

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