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A block of metal with a mass of 20 kg requires a horizontal force of 50 N to pull it with uniform velocity along a horizontal surface. Calculate the coefficient of friction between the surface and the block. (take g = 10 m/s)

Answer Text:
Since motion is uniform, the applied force is equal to the frictional force
#F_n# = normal reaction = Weight = #20times10=200# N
Therefore, μ =#(F_f) / (F_n)# =
#50/ 200 = 0.25#.