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How much work does a pulling force of 40 N do on the 20 kg box in pulling it 8 m across the floor at a constant speed. The pulling force is directed at 60° above the horizontal

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160 J

277 J

784 J

700 J

answer is A.

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Detailed Solution

$W = \vec{F} . \vec{s} = 40 \times 8 \times \cos 60 ° = 160 J$

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