a block of 60 kg mass with flat base area of 20cm3 begins to slide down a dry inclined plane at an angle of 300. When th

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a block of 60 kg mass with flat base area of
20cm3 begins to slide down a dry inclined plane at
an angle of 300. When the plane is smeared with 1mm
layer of lubricating oil, the same block slides down the plane with
a uniform velocity of 2m/s at a lower inclination of
150 to the horizontal, Calculate coefficient of dry
friction and kinematic viscosity of lubricant used