First slide

Work

Question

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

Moderate

A

160 J
B

277 J
C

784 J
D

None of the above

Solution

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

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