A boy pushes a toy box 2.0 m along the floor by means of a force of 10 N directed downward at an angle of 60∘ to the horizontal. The work done by the boy is
A
6 J
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B
8 J
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C
10 J
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D
12 J
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Solution
The correct option is C 10 J W=Fscosθ=10×2cos60∘=10J.