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JEE Main Physics question

PhysicsWork, Energy and PowerJEE Main

The coefficient of kinetic friction between a 20 kg box and the floor is 0.40. How much work does a pulling force do on the box in pulling it 8.0 m across the floor at constant speed? The pulling force is directed 37° above the horizontal.

Answer: (B)

Solution

At constant speed: Fcos37° = μ(mg−Fsin37°) ⟹ F(cos37°+μsin37°) = μmg ⟹ F =

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Question ID VK-153061