A block of mass 1 kg is pulled along the curve path ACB by a tangential force as shown in figure. The work done by the frictional force when the block moves from A to B is x Joule then find x. (Block is pulled very slowly), take $g = 9.8 ms^{- 2}$ .

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Work done by friction == ∫ F ⋅ ds = − ∫ 0 π ​ μ mg cos θ c o s θ dx ​ = − μ mgx

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