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Work, Energy and Power: RE-NEET 2026

Medium· Calculation of Work (Work Done by Variable Force (Work Done by Spring Force))· +4 / −1
A particle of mass MM moves along a horizontal xx axis from x=0x = 0 to x=Lx = L. The coefficient of kinetic friction varies as a function of xx as μk(x)=μ0−αx\mu_k(x) = \mu_0 - \alpha x, where μ0,α\mu_0, \alpha are constants of appropriate dimensions, so that μk(L)=0\mu_k(L) = 0. The total work done by the frictional force during the motion is nμ0MgLn\mu_0 MgL, where gg is the acceleration due to gravity. The value of nn is:
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