How much work does a pulling force of $40 \,N$ do on a $20 \,kg$ box in pulling it $8 \,m$ across the floor at a constant speed? The pulling force is directed at $60^\circ$ above the horizontal.
- A$160 \,J$
- B$277 \,J$
- C$784 \,J$
- DNone of the above
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