A person exerts a horizontal force of 500 N on a box, which also experiences a frictional force of 100 N. How much work is done against friction when the box moves a horizontal distance of 3 m?
A
300 J
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B
1200 J
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C
1500 J
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D
1800 J
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Solution
The correct option is A 300 J W=F×D =100×3=300J Hence, work done against friction when the box moves a horizontal distance of 3m is 300J.